Sources

453 sources cited across our notes. Each one lists the notes that cite it underneath.

1. 0.1% 2-kDa hyaluronic acid lotion, 8-week split-face comparison, 21 participants, 2023 (PMID 35587723)A
   Cited in: How to Layer Hyaluronic Acid: How Many Coats for a Dry Room
2. 0.1% retinaldehyde cream vs glycolic acid peels over 8 weeks, 55 women with photoaging, 2018 (PMID 30027612)A
   Cited in: Retinol Schedule for Beginners: 8 Weeks From Twice a Week to Daily
3. 0.5% bakuchiol vs 0.5% retinol cream, 12-week randomized trial, 44 participants, 2019 (PMID 29947134)A
   Cited in: Retinol Schedule for Beginners: 8 Weeks From Twice a Week to Daily
4. 10% vitamin C dual-chamber serum, 12-week trial, 66 participants, 2026 (PMID 42087444)A
   Cited in: How to Store Vitamin C Serum, Read Its Label, and Spot Oxidation
5. 12-week comparison of prescription topical gels with and without a moisturizing base, 20 people, 2009 (PMID 19537284)A
   Cited in: Acne Cream, First 2 Weeks: Logging Amount, Area, and Stinging
6. 12-week randomized comparison adding salicylic acid to prescription topicals, 49 participants, 2012 (PMID 22035285)A
   Cited in: AHA BHA in Your First 2 Weeks: Day-by-Day Plan and Stop Signs
7. 12-week randomized trial in 60 people with post-acne hyperpigmentation, 2023 (PMID 37213446)A
   Cited in: Melasma vs Hyperpigmentation vs Sun Spots: Notes Before Any Cream
8. 12-week randomized trial of beta-glucan with laser in 64 women with pregnancy stretch marks, 2022 (PMID 35570397)A
   Cited in: Skin Problems During Pregnancy: Adjust Your Routine by Trimester
9. 12-week RCT of an oral supplement in adult women with mild to moderate acne, 102 people, 2025 (PMID 40321085)A
   Cited in: Supplements for Acne: A 12-Week Log and When to Stop Taking Them
10. 14 days of occlusive glove wear and the skin barrier, 19 and 18 people, 1996 (PMID 8730163)A
    Cited in: Sheet Mask Every Day? The 5 Minutes After You Peel It Off
11. 14% gluconolactone (PHA) solution in acne: double-blind trial, 150 participants, 1992 (PMID 1303072)A
    Cited in: How Often Should You Exfoliate Your Face? A First-Month Weekly Plan
12. 2-week RCT of moisturizers containing glyceryl glucoside, 169 adults, 2012 (PMID 22916312)A
    Cited in: Moisturizer After Washing Your Face: When, How Much, How Often
13. 2% salicylic acid botanical spot gel, 10-day split-face trial, 25 participants, 2017 (PMID 28686778)A
    Cited in: Salicylic Acid for Beginners: Your First 2 Weeks, Day by Day
14. 20-minute patch test for immediate stinging and redness from cosmetics, 2020 (PMID 32279349)A
    Cited in: Pore Primer Days: Afternoon Touch-Ups to Evening Removal
15. 24-hour hydration after one application of a 1% hyaluronic acid, 5% glycerin and centella product, 20 women, 2017 (PMID 28860834)A
    Cited in: How to Use Toner by Situation: Pat, Swipe or Soaked-Pad Mask
16. 24-week phase 4 trial of a prescription topical plus skin care in post-acne hyperpigmentation, 60 and 63 patients, 2024 (PMID 38685118)A
    Cited in: Hyperpigmentation: Is It Fading? A Sunscreen and Monthly Photo Log
17. 3-week RCT comparing two cleansers in 40 women with sensitive skin, 2013 (PMID 24305430)A
    Cited in: Low pH Cleanser Switch: A 2-Week Log for Tightness and Redness
18. 4-t-butylcyclohexanol and licochalcone A in sensitive skin, 2016 (PMID 26805417)A
    Cited in: How to Calm Irritated Skin After New Products, Masks or Periods
19. 4-week patch application of finished cosmetics and microcomedones, reassessing the comedogenic concept, 2006 (PMID 16488305)B
    Cited in: How to Test New Skincare Products for Clogged Pores Over 4 Weeks
20. 4-week randomized trial of a moisturizing cream in 90 people with oily skin, 2023 (PMID 37194909)A
    Cited in: Oily Skin Routine by Time of Day: Morning, Midday and Night
21. 4-week RCT of skin care and cosmetic use coaching in 50 women with acne, 2006 (PMID 17073988)A
    Cited in: Acne Care Plan at Home: What to Check at 2, 6, and 12 Weeks
22. 42°C heat for 30 seconds and skin absorption of allantoin, 2014 (PMID 24445121)A
    Cited in: Pore Device Use Log: What to Record and When to Take a Break
23. 5-week randomized trial of liposomal aloe vera gel in 180 women with melasma during pregnancy, 2017 (PMID 28139161)A
    Cited in: Skin Problems During Pregnancy: Adjust Your Routine by Trimester
24. 5% sodium ascorbyl phosphate lotion, 12-week open trial, 60 participants, 2005 (PMID 18492184)B
    Cited in: How to Store Vitamin C Serum, Read Its Label, and Spot Oxidation
25. 6-week randomized trial adding a centella mask for rosacea patients, 64 people, 2024 (PMID 38831627)A
    Cited in: Soothing Ingredients by Situation: Red Days, Shaving, Exfoliation
26. 60-day randomized trial in 49 women with melasma, 2024 (PMID 39376788)A
    Cited in: Melasma vs Hyperpigmentation vs Sun Spots: Notes Before Any Cream
27. 8-week four-arm RCT of a probiotic and plant extract combination, 114 people, 2022 (PMID 35061237)A
    Cited in: Supplements for Acne: A 12-Week Log and When to Stop Taking Them
28. 90-day randomized trial of 10% glycolic acid emulsion for mild acne, 120 participants, 2011 (PMID 21896132)A
    Cited in: AHA BHA in Your First 2 Weeks: Day-by-Day Plan and Stop Signs
29. A dermocosmetic cream combined with adapalene: RCT, 291 participants, 8 weeks, 2024 (PMID 39430644)A
    Cited in: Skincare Routine Order: Where to Slot a New Product, How Long to Wait
30. A niacinamide-containing lotion and truncal acne: 8-week observational study, 43 participants, 2024 (PMID 39044362)B
    Cited in: Back Acne Body Wash: Workout Shower Order and a 4-Week Photo Log
31. AAD — Acne and dietInstitutional
    Cited in: Acne and Sleep: A Night Routine for Weeks You Stay Up Late, Oily Skin Routine by Time of Day: Morning, Midday and Night
32. AAD — Adult acne: Why it happens and what you can do for itInstitutional
    Cited in: Skin Breakout From a New Product? Pause, Then Add Back One by One
33. AAD — FolliculitisInstitutional
    Cited in: Male Acne on Shave Days and Workout Days: A Routine and Log
34. AAD — Is it okay to wear makeup?Institutional
    Cited in: Pore Device Use Log: What to Record and When to Take a Break
35. AAD — Is your workout causing your acne?Institutional
    Cited in: How to Wash an Acne-Prone Face by Situation: Mornings to Gym Days, Male Acne on Shave Days and Workout Days: A Routine and Log, Malassezia Folliculitis in Sweaty Months: Shower & Clothes Log
36. AAD — Sports equipment can cause acneInstitutional
    Cited in: Acne and Sleep: A Night Routine for Weeks You Stay Up Late, Malassezia Folliculitis in Sweaty Months: Shower & Clothes Log, Scalp Pimples: Checking Wash Time, Rinsing and Drying Habits
37. Acne and anxiety, depression, and stress: meta-analysis of 23 studies, 2023 (PMID 36751189)A
    Cited in: Stress Acne in Exam or Deadline Week: A Routine to Start at D-7
38. Acne and nutrition: systematic review, 2017 (PMID 27136757)A
    Cited in: Acne Diet Changes: Swap One Food at a Time and Log It for 4 Weeks
39. Acne and quality of life: in-depth interviews with 34 adolescents and 16 adults, 2018 (PMID 29435857)B
    Cited in: Teen Acne on School Days: Before Class, After Gym, During Exams
40. Acne management guidelines for Southeast Asia, 2015 (PMID 26211507)A
    Cited in: Mineral or Chemical Sunscreen: How Much, How Early, When to Reapply
41. Acne mechanica: mechanical friction, pressure and acne, 1975 (PMID 123732)C
    Cited in: Pimple Patch Log: What to Watch From Day 1 Night to Day 3
42. Acne prevalence and associated factors among dermatology outpatients in Ethiopia, 2025 (PMID 41006368)B
    Cited in: Temple Acne: Rinsing the Side of Your Face and Wiping Glasses Arms
43. Acne prevalence and associated factors in 390 dermatology outpatients in Ethiopia, 2025 (PMID 41006368)B
    Cited in: Forehead Acne Causes: Wash Order for Bangs and Hat Days
44. Acne scar prevalence in 2,201 18-year-old Brazilian men, 2016 (PMID 27438194)B
    Cited in: Male Acne on Shave Days and Workout Days: A Routine and Log
45. Acne scar types and timing of care for active acne, 2020 (PMID 33208997)B
    Cited in: Acne Scars: What to Watch for 3 Months After a Breakout Settles
46. Acne scar types and timing of care, 100 patients, 2020 (PMID 33208997)B
    Cited in: Nodular Acne: What to Log and Ask Before a Dermatology Visit
47. Adding a centella mask for 6 weeks in 64 people with rosacea: randomized trial, 2024 (PMID 38831627)A
    Cited in: Cica Cream: Reading the Centella Label and When to Start or Stop
48. Adding a moisturizer during azelaic acid 15% gel use and symptom scores, 2009 (PMID 19746764)B
    Cited in: Azelaic Acid, the First 4 Weeks: A Sting Log and Split Schedule
49. Adding a skincare regimen for adult women using adapalene/benzoyl peroxide: RCT, 299 women, 90 days, 2017 (PMID 28573779)A
    Cited in: Skincare Routine Order: Where to Slot a New Product, How Long to Wait
50. Adverse reactions to cosmetics and toiletries: interviews with 1,609 people in the general population, 1987 (PMID 19457012)B
    Cited in: Skin Breakout From a New Product? Pause, Then Add Back One by One
51. Aggravating factors in 110 adults with acne in India, 2018 (PMID 30078878)B
    Cited in: Back Acne Shower Routine: A Week of Wash Order, Sweat, Clothes
52. Agreement between photo-based remote assessment and in-person assessment, meta-analysis of 16 studies with 927 people, 2025 (PMID 41178312)A
    Cited in: PDRN Serum Before and After: A 4-Week Photo and Reaction Log
53. Allergic contact reactions to lip care cosmetics, systematic review of 47 reports and 58 people, 2024 (PMID 37904533)A
    Cited in: Acne Around Mouth: Cut Back One Product Every 2 Weeks, in Order
54. Aloe vera gel and closure time of surgical wounds, 1991 (PMID 2047051)A
    Cited in: Aloe Vera Gel First Use: A 3-Step Patch Test and Summer Storage
55. Aloe, mangosteen and green tea combined hydrogel: randomized comparison, 2019 (PMID 31239743)A
    Cited in: Aloe Vera Gel First Use: A 3-Step Patch Test and Summer Storage
56. Ambient humidity and the skin, literature review, 2016 (PMID 27306376)C
    Cited in: Oily Skin in Summer, Dry in Winter: Split Care by Face Zone, How to Layer Hyaluronic Acid: How Many Coats for a Dry Room
57. American Academy of Dermatology (AAD) — Is your workout causing your acne?Institutional
    Cited in: Temple Acne: Rinsing the Side of Your Face and Wiping Glasses Arms
58. American Academy of Dermatology guidelines of care for acne (GRADE, 18 recommendations), 2024 (PMID 38300170)A
    Cited in: Acne Medication Visit: A Record Sheet to Bring to Your Dermatologist
59. American Academy of Dermatology guidelines of care for the management of acne, 2024 (PMID 38300170)A
    Cited in: Azelaic Acid, the First 4 Weeks: A Sting Log and Split Schedule
60. Amount of cosmetic use in 910 adult acne patients, case-control study, 2013 (PMID 23859829)B
    Cited in: How to Test New Skincare Products for Clogged Pores Over 4 Weeks
61. Amount used per application and preservative exposure by sheet mask wear time, 175 people, 2022 (PMID 35075174)B
    Cited in: Sheet Mask Every Day? The 5 Minutes After You Peel It Off
62. Analysis of risk factors for post-acne hyperpigmentation, 2021 (PMID 34880967)B
    Cited in: Nose Sebum Smell: A One-Week Log of Washing and Daily Habits, Melasma vs Hyperpigmentation vs Sun Spots: Notes Before Any Cream
63. Analysis of the top 150 TikTok #acne videos, 2025 (PMID 40008491)C
    Cited in: Teen Acne on School Days: Before Class, After Gym, During Exams
64. Applying a vitamin-containing moisturizer first and early tolerability of tretinoin, split-face trial, 2006 (PMID 17121065)A
    Cited in: Niacinamide Morning or Night: Weekly Vitamin C and Retinol Plan
65. At-home blue and red LED device, double-blind RCT in 35 Korean people with acne, 2013 (PMID 23278295)A
    Cited in: Pore Device Use Log: What to Record and When to Take a Break
66. At-home blue light LED device, split-face comparison in 30 people with acne, 2011 (PMID 22091799)A
    Cited in: Pore Device Use Log: What to Record and When to Take a Break
67. Azelaic acid 15% gel use and sensory irritation in 40 women with rosacea, 2004 (PMID 15551720)B
    Cited in: Azelaic Acid, the First 4 Weeks: A Sting Log and Split Schedule
68. Azelaic acid for acne, rosacea and melasma: systematic review, 2023 (PMID 37550898)A
    Cited in: Azelaic Acid, the First 4 Weeks: A Sting Log and Split Schedule
69. Bentonite mask as add-on, RCT in 60 people with moderate acne, 8 weeks, 2025 (PMID 41347526)A
    Cited in: Clay Mask Night Routine: 30-Minute Steps and a Monthly Calendar
70. Benzophenone positivity among 19,618 patch-tested patients, 2023 (PMID 36917534)B
    Cited in: Sunscreen Breakouts: Test a New One From Jawline to Half-Face
71. Body mass index, sleep quality and severity in 98 acne patients, 2021 (PMID 34580504)B
    Cited in: Acne and Sleep: A Night Routine for Weeks You Stay Up Late
72. Body-site differences in SLS irritation: upper back vs. arm comparison, 2019 (PMID 30637727)A
    Cited in: Back Acne Shower Routine: A Week of Wash Order, Sweat, Clothes
73. British Association of Dermatologists — Patch testingInstitutional
    Cited in: Sensitive Skin and a New Product: 7 Days From Arm Test to Face
74. Candidate new allergens in the Spanish contact allergy registry, 2021 (PMID 34029518)B
    Cited in: Does Tea Tree Oil Go Bad? Storage, Oxidation, and an Arm Test Log
75. Case-control study of whey protein supplements and acne in men, 201 people, 2024 (PMID 38633058)B
    Cited in: Supplements for Acne: A 12-Week Log and When to Stop Taking Them
76. Causative ingredients of cosmetic contact allergy, 75 patients, 1987 (PMID 3652687)B
    Cited in: Pimple on Lip Keeps Coming Back? Swap Lip Products, Track Habits
77. Causative ingredients of cosmetic contact allergy, analysis of 75 patients, 1987 (PMID 3652687)B
    Cited in: Closed Comedones Routine: Fewer Steps, Then Watch for 4 Weeks
78. Centella cream vs. ceramide cream for 4 weeks in 30 dye workers, 2021 (PMID 34214362)A
    Cited in: Cica Cream: Reading the Centella Label and When to Start or Stop
79. Ceramide cream use in 102 workers with a hand skin condition, 2023 (PMID 36939821)A
    Cited in: Ceramide Cream Too Heavy? Try Lotion, Toner or Ampoule Textures
80. Ceramide cream vs paraffin cream: 4-week left-right RCT in 34 adults with dry, eczema-prone skin, 2022 (PMID 34921679)A
    Cited in: Damaged Skin Barrier: What to Stop and Keep in the First 3 Days
81. Ceramide moisturizer and time to symptom relapse, 2025 (PMID 39897204)A
    Cited in: Ceramide Cream Too Heavy? Try Lotion, Toner or Ampoule Textures
82. Ceramide-containing sunscreen with moisturizing cream and UV-induced skin changes, 2021 (PMID 33852258)A
    Cited in: Hyperpigmentation: Is It Fading? A Sunscreen and Monthly Photo Log
83. Cheek skin microbiome and mycobiome differences by skin sensitivity: 42 people, 2020 (PMID 32664687)B
    Cited in: Cheek Acne Causes: A 4-Week Order for Dry, Sensitive Cheeks
84. Clay and jojoba oil mask, 6-week observational study, 194 people, 2012 (PMID 22585103)B
    Cited in: Clay Mask Night Routine: 30-Minute Steps and a Monthly Calendar
85. Clay mask for oily and combination skin, 4 weeks, 75 people, 2023 (PMID 38009030)B
    Cited in: Clay Mask Night Routine: 30-Minute Steps and a Monthly Calendar
86. Cleaning power and barrier damage compared across four cleansers in 15 people, 2004 (PMID 14731242)B
    Cited in: Double Cleanse Sunscreen Days: Oil, Balm or Water as Step One?
87. Clinical and epidemiological analysis of 70 Malassezia folliculitis patients in Singapore, 1987 (PMID 3498698)B
    Cited in: Malassezia Folliculitis in Sweaty Months: Shower & Clothes Log
88. Clinical and laboratory findings of Malassezia folliculitis in Indonesia, 353 patients, 2022 (PMID 35920036)B
    Cited in: Folliculitis After Shaving or a Hot Tub: What to Watch for 2 Days
89. Clinical classification vs. ultrasound findings of acne scars, 41 people and 81 scars, 2013 (PMID 24118266)B
    Cited in: Acne Scar Cream? First Sort Your Scar Types and Prep for a Consult
90. Clinical effects of moisturizers: systematic review of 48 studies, 3,262 people, 2015 (PMID 26267423)A
    Cited in: How to Use Toner by Situation: Pat, Swipe or Soaked-Pad Mask
91. Clinical use of vitamin C in dermatology, systematic review of 44 papers, 2026 (PMID 42761976)A
    Cited in: How to Store Vitamin C Serum, Read Its Label, and Spot Oxidation
92. Clinicopathologic evaluation of folliculitis after waxing: 28 patients, 2014 (PMID 24134338)B
    Cited in: Acne Between Eyebrows: What to Watch for 3 Days After Grooming
93. Clinicopathologic evaluation of post-waxing folliculitis, 28 patients, 2014 (PMID 24134338)B
    Cited in: Folliculitis on Face? Daily Photos, Shaving Notes and Visit Prep, Folliculitis After Shaving or a Hot Tub: What to Watch for 2 Days
94. CO2 laser combined with a topical serum for atrophic acne scars in 100 people, randomized trial, 2026 (PMID 42621380)A
    Cited in: PDRN Serum Before and After: A 4-Week Photo and Reaction Log
95. Cochrane overview of 6 systematic reviews on non-systemic acne care, 2024 (PMID 39440650)A
    Cited in: Acne Medication Visit: A Record Sheet to Bring to Your Dermatologist
96. Cochrane review comparing topical acne ingredients, 49 RCTs and 3,880 people, 2020 (PMID 33034949)A
    Cited in: Acne Cream, First 2 Weeks: Logging Amount, Area, and Stinging
97. Comedogenicity of four vitamin E creams: 4-week test, 2021 (PMID 34471722)A
    Cited in: Closed Comedones: A 4-Week Count Map for Forehead, Cheeks, and Chin
98. Comparing moisturizers during acne medication use: split-face RCT, 40 Asian patients, 4 weeks, 2026 (PMID 41891349)A
    Cited in: Moisturizer for Acne-Prone Skin: How Much in Summer, Winter, on Meds
99. Comparison of Malassezia staining diagnosis in 264 folliculitis patients, 2013 (PMID 23706503)B
    Cited in: Malassezia Folliculitis in Sweaty Months: Shower & Clothes Log
100. Comparison of microneedling depths for atrophic acne scars, 14 people, 2024 (PMID 38159109)A
     Cited in: Acne Scar Cream? First Sort Your Scar Types and Prep for a Consult
101. Comparison of topical formulas for solar lentigines in 50 Asian women, 2002 (PMID 12077522)A
     Cited in: Melasma vs Hyperpigmentation vs Sun Spots: Notes Before Any Cream
102. Confocal microscopy of follicles in adult female acne, 2018 (PMID 29369333)B
     Cited in: Whiteheads and Blackheads: A Week-by-Week Plan Without Squeezing
103. Confocal microscopy of hair follicles in adult female acne, 2018 (PMID 29369333)B
     Cited in: Acne Location Meaning: What 2 Weeks of Breakout Notes Can Show, Acne Between Eyebrows: What to Watch for 3 Days After Grooming, Forehead Acne Causes: Wash Order for Bangs and Hat Days, Jawline Acne Causes: A 2-Week Log for Period, Shave and Mask Days
104. Consensus guide to acne approaches by lesion type, 2016 (PMID 27177989)A
     Cited in: Acne Severity: Count Your Spots at the Mirror and Log Each Week
105. Consensus of 8 international experts on the role of dermocosmetics in acne care, 2025 (PMID 38877766)A
     Cited in: Acne Care Plan at Home: What to Check at 2, 6, and 12 Weeks
106. Contact sensitization in the general adult population of Norway, 2007 (PMID 17177703)B
     Cited in: Neck Acne: Reset What Touches Your Neck and How Far You Rinse
107. Contact sensitization in the general adult population: 1,236 people in Norway, 2007 (PMID 17177703)B
     Cited in: Ear Acne: Check Earbuds, Earrings, and Your Phone in This Order
108. Controlled trial in 13 people with keloidal folliculitis on the back of the neck, 2018 (PMID 29587518)A
     Cited in: Folliculitis vs Acne: A Few-Day Log Before Any Ointment Hunt
109. Correlation of comedone sites on the face, upper chest, and back in 66 women with acne, 2016 (PMID 26094640)B
     Cited in: How to Test New Skincare Products for Clogged Pores Over 4 Weeks
110. Cosmetic Ingredient Review (CIR, US) — Safety assessment of panthenol and pantothenic acidInstitutional
     Cited in: Soothing Ingredients by Situation: Red Days, Shaving, Exfoliation
111. Cosmetic use and acne flare-ups, survey of 539 Korean acne patients, 2021 (PMID 33206430)B
     Cited in: How to Test New Skincare Products for Clogged Pores Over 4 Weeks
112. Cosmetic use and acne risk: case-control survey, 151 people, 2025 (PMID 40765696)B
     Cited in: Pore Primer Days: Afternoon Touch-Ups to Evening Removal
113. Cosmetic use and side effects, survey of 248 adolescents in Türkiye, 2026 (PMID 42493743)B
     Cited in: PDRN Serum Before and After: A 4-Week Photo and Reaction Log
114. Cosmetics made with noncomedogenic ingredients and the rate of acne cosmetica, 1976 (PMID 138532)B
     Cited in: How to Test New Skincare Products for Clogged Pores Over 4 Weeks
115. Cream targeting neurovascular hyperreactivity in sensitive skin: split-face RCT, 33 people, 28 days, 2025 (PMID 40736038)A
     Cited in: How to Calm Irritated Skin After New Products, Masks or Periods
116. Cross-sectional histology study of atrophic acne scar depth in skin of color, 49 samples, 2026 (PMID 40826840)B
     Cited in: Acne Scar Cream? First Sort Your Scar Types and Prep for a Consult
117. Cross-sectional study of acne scar types and timing of care, 100 people, 2020 (PMID 33208997)B
     Cited in: Acne Scar Cream? First Sort Your Scar Types and Prep for a Consult
118. Crossover trial of handwashing 4 times a day for 2 weeks with and without hand cream, 25 people, 2006 (PMID 16476166)B
     Cited in: How Often to Wash Your Face: Track Tightness and Shine for 1 Week
119. Cumulative irritation from fruit acids combined with SLS, 2005 (PMID 16040403)A
     Cited in: Skip Toner and Use Only Lotion? Run a 2-Week Step-Removal Test
120. Dairy intake and acne: meta-analysis of 78,529 people aged 7–30, 2018 (PMID 30096883)A
     Cited in: Acne Diet Changes: Swap One Food at a Time and Log It for 4 Weeks
121. Definition of sensitive skin — International Forum for the Study of Itch consensus, 2017 (PMID 26939643)A
     Cited in: Sensitive Skin and a New Product: 7 Days From Arm Test to Face
122. Dexpanthenol contact allergy in 2,171 patch-tested patients, retrospective analysis, 2018 (PMID 30009460)B
     Cited in: How to Use Panthenol Cream the Day After Exfoliating or Shaving
123. Diet (glycemic load, dairy) and acne: systematic review of 34 studies, 2022 (PMID 35373155)A
     Cited in: How to Get Better Skin by Charting Bedtime, Meals, Stress Weekly
124. Dose-dependent irritation of a surfactant mixture on patch testing, 13 people, 1999 (PMID 18503452)B
     Cited in: Foam Cleanser Switch: A 2-Week Log for Tightness and Breakouts
125. Double-blind trial of a cream with Centella asiatica extract and stretch marks in 80 pregnant women, 1991 (PMID 19291041)A
     Cited in: Skin Problems During Pregnancy: Adjust Your Routine by Trimester
126. Dual-wavelength laser vs. aloe vera gel for post-acne redness: half-face comparison, 2026 (PMID 42087432)A
     Cited in: Aloe Vera Gel First Use: A 3-Step Patch Test and Summer Storage
127. Ear piercing and metal allergy: patch tests in 377 patients, 1997 (PMID 9197955)B
     Cited in: Ear Acne: Check Earbuds, Earrings, and Your Phone in This Order
128. Effect of topical linoleic acid on acne microcomedones, digital image analysis, 1998 (PMID 9692305)A
     Cited in: Closed Comedones Routine: Fewer Steps, Then Watch for 4 Weeks
129. Effects of four AHAs on stratum corneum barrier function, 11 people, 1997 (PMID 9470910)A
     Cited in: Toner Pads: How Many Swipes, How Long to Leave On, How Often
130. Effects of hard water (calcium) and surfactants on skin irritation, 1996 (PMID 9118628)A
     Cited in: How to Wash an Acne-Prone Face by Situation: Mornings to Gym Days
131. Effects of soap and cleansers on infant skin pH and surface lipids, 40 infants, 1997 (PMID 9407174)B
     Cited in: Foam Cleanser Switch: A 2-Week Log for Tightness and Breakouts
132. Eight-week use of micellar water, cream and serum and facial redness, 60 participants, 2020 (PMID 32623833)B
     Cited in: Cleansing Oil: A 3-Minute Routine for Emulsifying and Rinsing
133. Epidemiological survey of 1,236 acne patients at 17 hospitals in Korea, 2011 (PMID 21595660)B
     Cited in: How to Get Better Skin by Charting Bedtime, Meals, Stress Weekly
134. Epidemiology of acne: survey of 1,236 patients at 17 Korean hospitals, 2011 (PMID 21595660)B
     Cited in: Closed Comedones: A 4-Week Count Map for Forehead, Cheeks, and Chin
135. Epidemiology of acne: systematic review, 2013 (PMID 23210645)A
     Cited in: Adult Acne: Did It Carry Over From Your Teens or Start Fresh?
136. Essential oils, acne, and skin aging, literature review, 2026 (PMID 42381131)C
     Cited in: Does Tea Tree Oil Go Bad? Storage, Oxidation, and an Arm Test Log
137. Evidence since the NICE acne guideline — UK acne expert panel, 2024 (PMID 39305432)A
     Cited in: Acne Severity: Count Your Spots at the Mirror and Log Each Week
138. Evidence since the NICE acne guideline — UK Acne Working Group, 2024 (PMID 39305432)A
     Cited in: Back Acne Body Wash: Workout Shower Order and a 4-Week Photo Log, Back Acne Shower Routine: A Week of Wash Order, Sweat, Clothes, Nodular Acne: What to Log and Ask Before a Dermatology Visit
139. Exercise-related skin conditions among gym users in Saudi Arabia: cross-sectional survey, 2025 (PMID 41234265)B
     Cited in: Back Acne Body Wash: Workout Shower Order and a 4-Week Photo Log, Damaged Skin Barrier: What to Stop and Keep in the First 3 Days
140. Exercise-related skin symptoms among gym users, 2025 (PMID 41234265)B
     Cited in: Male Acne on Shave Days and Workout Days: A Routine and Log
141. Expert consensus on acne care algorithms by acne type, 2016 (PMID 27177989)A
     Cited in: Nodular Acne: What to Log and Ask Before a Dermatology Visit
142. Expert consensus on age-specific management of pediatric and adolescent acne, 2020 (PMID 32574026)A
     Cited in: Teen Acne on School Days: Before Class, After Gym, During Exams
143. Expert consensus on integrated cleansing, moisturizing, and sun protection for acne, rosacea, and sensitive skin, 2023 (PMID 36409588)A
     Cited in: How to Wash an Acne-Prone Face by Situation: Mornings to Gym Days
144. Face mask use and skin damage: a cross-sectional survey in Saudi Arabia, 2022 (PMID 36532930)B
     Cited in: Maskne on Long Mask Days: A Swap, Break and Moisturizer Schedule
145. Face-washing frequency (1, 2 or 4 times a day) and acne, randomized trial, 2006 (PMID 17014635)A
     Cited in: Blackhead Removal on Your Nose: A No-Squeeze Weekly Calendar
146. Facial sebum and red blood cell fatty acids in moderate acne, 2022 (PMID 35800343)B
     Cited in: Jawline Acne Causes: A 2-Week Log for Period, Shave and Mask Days
147. Facial skin conditions from mask wearing during COVID-19: 2,326 people, 2022 (PMID 36483886)B
     Cited in: Cheek Acne Causes: A 4-Week Order for Dry, Sensitive Cheeks
148. Five-step cosmetic set with six molecular weights of hyaluronic acid, randomized trial in 40 women, 2014 (PMID 25399620)A
     Cited in: How to Layer Hyaluronic Acid: How Many Coats for a Dry Room
149. Food intake and severity in acne patients: 53 patients and 53 controls, 2020 (PMID 31840382)B
     Cited in: Acne Diet Changes: Swap One Food at a Time and Log It for 4 Weeks
150. Forehead and nose oiliness with a 6% guava extract toner: 28-day split-face trial, 21 people with oily skin, 2019 (PMID 30964238)A
     Cited in: How to Remove Sebum from Your Face? Track Your Shine for 2 Weeks First
151. Four AHAs and stratum corneum barrier function, 11 participants, 1997 (PMID 9470910)A
     Cited in: AHA BHA in Your First 2 Weeks: Day-by-Day Plan and Stop Signs
152. Four anti-irritant ingredients in a cumulative irritation model, 2006 (PMID 16918614)A
     Cited in: Skip Toner and Use Only Lotion? Run a 2-Week Step-Removal Test
153. Four-week use of a lipid-replenishing cleansing oil and balm, 21 participants, 2026 (PMID 41532885)B
     Cited in: Cleansing Oil: A 3-Minute Routine for Emulsifying and Rinsing
154. Frequency and characteristics of itch in acne, 2008 (PMID 18631277)B
     Cited in: Neck Acne: Reset What Touches Your Neck and How Far You Rinse
155. Frequency and features of itch in acne, observational study of 120 patients, 2008 (PMID 18631277)B
     Cited in: Butt Acne on Sitting Days vs. Workout Days: Underwear and Showers
156. Frequency of post-acne hyperpigmentation across seven Asian countries, 2016 (PMID 26813513)B
     Cited in: Dark Spots on Buttocks? Track Sitting Hours, Clothes and Scrubbing
157. Frequency of post-acne hyperpigmentation in 324 acne patients across 7 Asian countries, 2016 (PMID 26813513)B
     Cited in: How Long Acne Marks Last: Red vs. Brown, Tracked in Monthly Photos
158. Frequency of post-inflammatory hyperpigmentation after acne in seven Asian countries, 2016 (PMID 26813513)B
     Cited in: Acne on Nose: Log Pore Strips, Glasses Pads and Nose Blowing
159. Frictional dermal melanosis in 52 patients, 2012 (PMID 23248362)B
     Cited in: Dark Spots on Buttocks? Track Sitting Hours, Clothes and Scrubbing
160. Galactomyces, panthenol and centella serum and post-acne hyperpigmentation, 2021 (PMID 33938432)A
     Cited in: Cica Cream: Reading the Centella Label and When to Start or Stop
161. Gel with tea tree oil nanoemulsion, 12-week randomized trial, 100 participants, 2022 (PMID 34251536)A
     Cited in: Does Tea Tree Oil Go Bad? Storage, Oxidation, and an Arm Test Log
162. Genistein, vitamin E, niacinamide and ceramide cream in 50 postmenopausal women, 6 weeks, 2023 (PMID 36835861)A
     Cited in: Large Pores: An 8-Week Photo Log to Keep Before Trying Anything
163. Gram-negative folliculitis in acne and rosacea patients on long-term antibiotics, 46 patients, 1999 (PMID 10321942)B
     Cited in: Folliculitis on Face? Daily Photos, Shaving Notes and Visit Prep
164. High-protein, low-glycemic-load diet and acne: randomized trial in 43 men over 12 weeks, 2007 (PMID 17448569)A
     Cited in: Acne Diet Changes: Swap One Food at a Time and Log It for 4 Weeks
165. HMP foam cleanser vs. a commercial cleanser in 40 women with sensitive skin, 3-week RCT, 2013 (PMID 24305430)A
     Cited in: Foam Cleanser Switch: A 2-Week Log for Tightness and Breakouts
166. Hormone levels by age group in 72 women with hard-to-manage acne, 2016 (PMID 27840992)B
     Cited in: Adult Acne: Did It Carry Over From Your Teens or Start Fresh?, Acne Before Period: Adjusting Skincare From Ovulation to Day 1
167. Hydration over 24 hours after a single application of lamellar moisturizers, 30 participants, 2020 (PMID 32167240)A
     Cited in: Dehydrated Oily Skin? Log Tightness and Shine at 3 Times of Day
168. Hydrogel containing natural extracts applied to acne, 24 people, 2021 (PMID 34765083)B
     Cited in: Pimple Patch Log: What to Watch From Day 1 Night to Day 3
169. Hypersensitivity reactions seen with fragrance-series patch testing, 2019 (PMID 31807444)B
     Cited in: Neck Acne: Reset What Touches Your Neck and How Far You Rinse
170. Immediate irritation from a ceramide cream vs. a 5% urea cream, 2020 (PMID 32372387)A
     Cited in: Ceramide Cream Too Heavy? Try Lotion, Toner or Ampoule Textures
171. Impulsivity in acne patients who pick their skin, 60 people, 2023 (PMID 36409553)B
     Cited in: Should I Pop My Pimple or Wait? A Habit Log for When Urges Strike
172. Impulsivity in patients who pick at acne, 30 vs 30, 2023 (PMID 36409553)B
     Cited in: Pimple Before a Big Event? A 48-Hour Step-by-Step Timeline
173. Impulsivity traits in patients who pick their acne, 2023 (PMID 36409553)B
     Cited in: Acne on Nose: Log Pore Strips, Glasses Pads and Nose Blowing
174. Individual, family, and environmental factors in acne: 3,826 patients and 759 controls, 2019 (PMID 28704984)B
     Cited in: Stress Acne in Exam or Deadline Week: A Routine to Start at D-7
175. Inflammatory interleukin-1 alpha in 108 open comedones from 18 acne patients, 1992 (PMID 1534342)B
     Cited in: How to Remove Sebum from Your Face? Track Your Shine for 2 Weeks First
176. Ingredients behind cosmetic contact allergy: 75 patients, 1987 (PMID 3652687)B
     Cited in: Skin Breakout From a New Product? Pause, Then Add Back One by One
177. Ingredients causing contact allergy to cosmetics, 1987 (PMID 3652687)B
     Cited in: Acne Cream Trial: How to Log a New Cream Over the First 4 Weeks
178. Ingrown-hair bumps after shaving and a glycolic acid lotion, 35 men, 1993 (PMID 8261811)A
     Cited in: Male Acne on Shave Days and Workout Days: A Routine and Log
179. International expert consensus on dermocosmetics in acne care, 2025 (PMID 38877766)A
     Cited in: Acne Cream Trial: How to Log a New Cream Over the First 4 Weeks
180. Irritation test of workplace skin cleansers washed 3 times a day for 4 days, 25 healthy people, 2014 (PMID 24588368)B
     Cited in: How Often to Wash Your Face: Track Tightness and Shine for 1 Week
181. Italian dermatologists' views on camouflage makeup for female acne patients: survey, 334 respondents, 2017 (PMID 27284779)B
     Cited in: How to Wear Makeup on a Breakout Day: Cover, Touch Up, Take It Off
182. Itch in 120 acne patients, 2008 (PMID 18631277)B
     Cited in: Stress Acne in Exam or Deadline Week: A Routine to Start at D-7
183. Itch survey of 120 patients with acne, 2008 (PMID 18631277)B
     Cited in: Malassezia Folliculitis in Sweaty Months: Shower & Clothes Log, Scalp Pimples: Checking Wash Time, Rinsing and Drying Habits
184. Kinetin and niacinamide split-face RCT, 52 Taiwanese people, 12 weeks, 2007 (PMID 18047609)A
     Cited in: Large Pores: An 8-Week Photo Log to Keep Before Trying Anything
185. Korea Cosmetic Association ingredient dictionary — Centella Asiatica Leaf Water (code 8337, linked), Centella Asiatica Extract (540), Madecassoside (70) (Korean)Institutional
     Cited in: Cica Cream: Reading the Centella Label and When to Start or Stop
186. Korea Disease Control and Prevention Agency (KDCA) National Health Information Portal — Acne (Korean, updated 2026-08-03)Institutional
     Cited in: Male Acne on Shave Days and Workout Days: A Routine and Log, Temple Acne: Rinsing the Side of Your Face and Wiping Glasses Arms, Acne Severity: Count Your Spots at the Mirror and Log Each Week, Whiteheads and Blackheads: A Week-by-Week Plan Without Squeezing, Acne Scars: What to Watch for 3 Months After a Breakout Settles
187. Korea Disease Control and Prevention Agency (KDCA) National Health Information Portal — Acne (Korean)Institutional
     Cited in: How to Wash an Acne-Prone Face by Situation: Mornings to Gym Days, Sunscreen Breakouts: Test a New One From Jawline to Half-Face, Blackhead Removal on Your Nose: A No-Squeeze Weekly Calendar, Oily Skin in Summer, Dry in Winter: Split Care by Face Zone, Pimple Patch Log: What to Watch From Day 1 Night to Day 3, Clay Mask Night Routine: 30-Minute Steps and a Monthly Calendar, Large Pores: An 8-Week Photo Log to Keep Before Trying Anything, Forehead Acne Causes: Wash Order for Bangs and Hat Days, Jawline Acne Causes: A 2-Week Log for Period, Shave and Mask Days, Acne Before Period: Adjusting Skincare From Ovulation to Day 1, Maskne on Long Mask Days: A Swap, Break and Moisturizer Schedule, Pimples on Back of Neck: A 2-Week Haircut, Ponytail, Collar Log, Neck Acne: Reset What Touches Your Neck and How Far You Rinse, Acne on Nose: Log Pore Strips, Glasses Pads and Nose Blowing, Oily Skin Routine by Time of Day: Morning, Midday and Night, Acne Around Mouth: Cut Back One Product Every 2 Weeks, in Order, AHA BHA in Your First 2 Weeks: Day-by-Day Plan and Stop Signs, Cleansing Cream: When to Use It, by How Much Makeup You Wear, Cleansing Oil: A 3-Minute Routine for Emulsifying and Rinsing, Low pH Cleanser Switch: A 2-Week Log for Tightness and Redness, Double Cleanse Sunscreen Days: Oil, Balm or Water as Step One?, Folliculitis vs Acne: A Few-Day Log Before Any Ointment Hunt, Acne Medication Order for Two or More Creams, and the Wait Between, Nose Sebum Smell: A One-Week Log of Washing and Daily Habits, Should I Pop My Pimple or Wait? A Habit Log for When Urges Strike, Closed Comedones Routine: Fewer Steps, Then Watch for 4 Weeks, Nodular Acne: What to Log and Ask Before a Dermatology Visit, Pimple Before a Big Event? A 48-Hour Step-by-Step Timeline, Pustules: What to Do and What to Skip in the First 3 Days, Scalp Pimples: Checking Wash Time, Rinsing and Drying Habits
188. Korea Disease Control and Prevention Agency (KDCA) National Health Information Portal — Acne, updated 2026-08-03 (Korean)Institutional
     Cited in: Acne Care Plan at Home: What to Check at 2, 6, and 12 Weeks
189. Korea Disease Control and Prevention Agency (KDCA) National Health Information Portal — Cellulitis (Korean)Institutional
     Cited in: Folliculitis After Shaving or a Hot Tub: What to Watch for 2 Days
190. Korea Disease Control and Prevention Agency (KDCA) National Health Information Portal — Cellulitis and boils (Korean, updated 2026-08-13)Institutional
     Cited in: Dark Spots on Buttocks? Track Sitting Hours, Clothes and Scrubbing
191. Korea Disease Control and Prevention Agency (KDCA) National Health Information Portal — Cellulitis and boils (Korean)Institutional
     Cited in: Pimples on Back of Neck: A 2-Week Haircut, Ponytail, Collar Log, Butt Acne on Sitting Days vs. Workout Days: Underwear and Showers, Folliculitis on Face? Daily Photos, Shaving Notes and Visit Prep, Folliculitis After Shaving or a Hot Tub: What to Watch for 2 Days
192. Korea Disease Control and Prevention Agency (KDCA) National Health Information Portal — Herpes simplex infection (Korean)Institutional
     Cited in: Folliculitis After Shaving or a Hot Tub: What to Watch for 2 Days, Pimple on Lip Keeps Coming Back? Swap Lip Products, Track Habits
193. Korea Disease Control and Prevention Agency (KDCA) National Health Information Portal — Irregular menstrual cycles and premenstrual syndrome (Korean)Institutional
     Cited in: Acne Before Period: Adjusting Skincare From Ovulation to Day 1
194. Korea Disease Control and Prevention Agency (KDCA) National Health Information Portal — Irritant contact dermatitis (Korean)Institutional
     Cited in: Maskne on Long Mask Days: A Swap, Break and Moisturizer Schedule, Neck Acne: Reset What Touches Your Neck and How Far You Rinse
195. Korea Disease Control and Prevention Agency (KDCA) National Health Information Portal — Safe cosmetic use for teens (Korean)Institutional
     Cited in: Acne and Sleep: A Night Routine for Weeks You Stay Up Late, Cleansing Cream: When to Use It, by How Much Makeup You Wear, Cleansing Oil: A 3-Minute Routine for Emulsifying and Rinsing, Low pH Cleanser Switch: A 2-Week Log for Tightness and Redness, Acne Cream Trial: How to Log a New Cream Over the First 4 Weeks, Sensitive Skin and a New Product: 7 Days From Arm Test to Face, Mineral or Chemical Sunscreen: How Much, How Early, When to Reapply, Toner Pads: How Many Swipes, How Long to Leave On, How Often, Double Cleanse Sunscreen Days: Oil, Balm or Water as Step One?
196. Korea Disease Control and Prevention Agency (KDCA) National Health Information Portal — Seborrheic dermatitis (Korean)Institutional
     Cited in: Pimples on Back of Neck: A 2-Week Haircut, Ponytail, Collar Log, Acne on Nose: Log Pore Strips, Glasses Pads and Nose Blowing, Malassezia Folliculitis in Sweaty Months: Shower & Clothes Log, Scalp Pimples: Checking Wash Time, Rinsing and Drying Habits
197. Korea Disease Control and Prevention Agency (KDCA) National Health Information Portal — Wound care and scars (Korean, updated 2026-08-03)Institutional
     Cited in: Acne Scars: What to Watch for 3 Months After a Breakout Settles
198. Korea Disease Control and Prevention Agency (KDCA), National Health Information Portal — Acne (Korean)Institutional
     Cited in: Moisturizer for Acne-Prone Skin: How Much in Summer, Winter, on Meds, Skincare Routine Order: Where to Slot a New Product, How Long to Wait, Back Acne Body Wash: Workout Shower Order and a 4-Week Photo Log, Damaged Skin Barrier: What to Stop and Keep in the First 3 Days, How to Wear Makeup on a Breakout Day: Cover, Touch Up, Take It Off, Closed Comedones: A 4-Week Count Map for Forehead, Cheeks, and Chin, Dehydrated Oily Skin? Log Tightness and Shine at 3 Times of Day, How to Remove Sebum from Your Face? Track Your Shine for 2 Weeks First, How Often Should You Exfoliate Your Face? A First-Month Weekly Plan
199. Korea Disease Control and Prevention Agency, National Health Information Portal — Acne (Korean)Institutional
     Cited in: Pore Primer Days: Afternoon Touch-Ups to Evening Removal, Teen Acne on School Days: Before Class, After Gym, During Exams, How to Use Toner by Situation: Pat, Swipe or Soaked-Pad Mask, Acne Diet Changes: Swap One Food at a Time and Log It for 4 Weeks, Acne Location Meaning: What 2 Weeks of Breakout Notes Can Show, Adult Acne: Did It Carry Over From Your Teens or Start Fresh?, Back Acne Shower Routine: A Week of Wash Order, Sweat, Clothes, Cheek Acne Causes: A 4-Week Order for Dry, Sensitive Cheeks, Stress Acne in Exam or Deadline Week: A Routine to Start at D-7, Ceramide Cream Too Heavy? Try Lotion, Toner or Ampoule Textures, How to Test New Skincare Products for Clogged Pores Over 4 Weeks, Salicylic Acid for Beginners: Your First 2 Weeks, Day by Day, Acne Cream, First 2 Weeks: Logging Amount, Area, and Stinging, Acne Scar Cream? First Sort Your Scar Types and Prep for a Consult, Supplements for Acne: A 12-Week Log and When to Stop Taking Them, Acne Medication Visit: A Record Sheet to Bring to Your Dermatologist, How Often to Wash Your Face: Track Tightness and Shine for 1 Week
200. Korea Disease Control and Prevention Agency, National Health Information Portal — Acne, face-washing guidance (Korean)Institutional
     Cited in: Flaky Skin on Face? Change Your Washing Habits Over 7 Days First
201. Korea Disease Control and Prevention Agency, National Health Information Portal — Acne, shaving guidance (Korean)Institutional
     Cited in: How to Use Panthenol Cream the Day After Exfoliating or Shaving
202. Korea Disease Control and Prevention Agency, National Health Information Portal — Keloid (Korean)Institutional
     Cited in: Ear Acne: Check Earbuds, Earrings, and Your Phone in This Order
203. Korea Disease Control and Prevention Agency, National Health Information Portal — Safe cosmetic use for teens (Korean)Institutional
     Cited in: PDRN Serum Before and After: A 4-Week Photo and Reaction Log
204. Korea's Enforcement Rule of the Cosmetics Act [Annex 4] Labeling standards and methods for cosmetic packaging (amended 2025-02-07) (Korean)Institutional
     Cited in: Cica Cream: Reading the Centella Label and When to Start or Stop
205. Korea's Ministry of Food and Drug Safety (Busan office) consumer newsletter — Are acne cosmetics a treatment?, 2025-05-30 (Korean)Institutional
     Cited in: Aloe Vera Gel First Use: A 3-Step Patch Test and Summer Storage, Cica Cream: Reading the Centella Label and When to Start or Stop
206. Korea's Ministry of Food and Drug Safety (Busan regional office) consumer newsletter — Are acne cosmetics a treatment? (Korean, 2025-05-30)Institutional
     Cited in: Salicylic Acid for Beginners: Your First 2 Weeks, Day by Day, How to Store Vitamin C Serum, Read Its Label, and Spot Oxidation
207. Korea's Ministry of Food and Drug Safety (MFDS, Busan office) consumer newsletter — Are acne cosmetics a treatment? (Korean, 2025-05-30)Institutional
     Cited in: Foam Cleanser Switch: A 2-Week Log for Tightness and Breakouts, Pimple Patch Log: What to Watch From Day 1 Night to Day 3
208. Korea's Ministry of Food and Drug Safety (MFDS) — Draft amendment to the functional cosmetics review regulation, public notice No. 2026-409 (Korean)Institutional
     Cited in: Sunscreen Breakouts: Test a New One From Jawline to Half-Face
209. Korea's Ministry of Food and Drug Safety (MFDS) — Proposed amendment to the regulation on review of functional cosmetics, pre-announcement notice No. 2026-409 (Korean)Institutional
     Cited in: Mineral or Chemical Sunscreen: How Much, How Early, When to Reapply
210. Korea's Ministry of Food and Drug Safety drug safety portal — Restricted cosmetic ingredients: 1,7-heptanedicarboxylic acid (azelaic acid), its salts and derivatives (reference date 2021-08-24) (Korean)Institutional
     Cited in: Azelaic Acid, the First 4 Weeks: A Sting Log and Split Schedule
211. Korean Dermatological Association — Acne vulgaris (Korean)Institutional
     Cited in: Acne Care Plan at Home: What to Check at 2, 6, and 12 Weeks, How to Wash an Acne-Prone Face by Situation: Mornings to Gym Days, Back Acne Body Wash: Workout Shower Order and a 4-Week Photo Log, How to Wear Makeup on a Breakout Day: Cover, Touch Up, Take It Off, Dehydrated Oily Skin? Log Tightness and Shine at 3 Times of Day, How to Remove Sebum from Your Face? Track Your Shine for 2 Weeks First, How Often Should You Exfoliate Your Face? A First-Month Weekly Plan, Male Acne on Shave Days and Workout Days: A Routine and Log, Blackhead Removal on Your Nose: A No-Squeeze Weekly Calendar, Oily Skin in Summer, Dry in Winter: Split Care by Face Zone, Pore Device Use Log: What to Record and When to Take a Break, Large Pores: An 8-Week Photo Log to Keep Before Trying Anything, Pore Primer Days: Afternoon Touch-Ups to Evening Removal, How to Get Better Skin by Charting Bedtime, Meals, Stress Weekly, How to Calm Irritated Skin After New Products, Masks or Periods, Teen Acne on School Days: Before Class, After Gym, During Exams, How to Use Toner by Situation: Pat, Swipe or Soaked-Pad Mask, Acne Location Meaning: What 2 Weeks of Breakout Notes Can Show, Jawline Acne Causes: A 2-Week Log for Period, Shave and Mask Days, Pimples on Back of Neck: A 2-Week Haircut, Ponytail, Collar Log, Neck Acne: Reset What Touches Your Neck and How Far You Rinse, Acne on Nose: Log Pore Strips, Glasses Pads and Nose Blowing, Azelaic Acid, the First 4 Weeks: A Sting Log and Split Schedule, Ceramide Cream Too Heavy? Try Lotion, Toner or Ampoule Textures, How to Test New Skincare Products for Clogged Pores Over 4 Weeks, At What Age Does Acne Stop? A Decade-by-Decade Check, Teens to 40s, How Long Acne Marks Last: Red vs. Brown, Tracked in Monthly Photos, Acne Cream, First 2 Weeks: Logging Amount, Area, and Stinging, Acne Scar Cream? First Sort Your Scar Types and Prep for a Consult, Sheet Mask Every Day? The 5 Minutes After You Peel It Off, Acne Medication Visit: A Record Sheet to Bring to Your Dermatologist, Folliculitis vs Acne: A Few-Day Log Before Any Ointment Hunt, Acne Medication Order for Two or More Creams, and the Wait Between, Nose Sebum Smell: A One-Week Log of Washing and Daily Habits, Melasma vs Hyperpigmentation vs Sun Spots: Notes Before Any Cream, Should I Pop My Pimple or Wait? A Habit Log for When Urges Strike, Acne Severity: Count Your Spots at the Mirror and Log Each Week, Butt Acne on Sitting Days vs. Workout Days: Underwear and Showers, Dark Spots on Buttocks? Track Sitting Hours, Clothes and Scrubbing, Closed Comedones Routine: Fewer Steps, Then Watch for 4 Weeks, Whiteheads and Blackheads: A Week-by-Week Plan Without Squeezing, Folliculitis on Face? Daily Photos, Shaving Notes and Visit Prep, Nodular Acne: What to Log and Ask Before a Dermatology Visit, Acne Scars: What to Watch for 3 Months After a Breakout Settles, Pustules: What to Do and What to Skip in the First 3 Days
212. Korean Dermatological Association — Acne vulgaris, side effects of topical retinoids (Korean)Institutional
     Cited in: Retinol Schedule for Beginners: 8 Weeks From Twice a Week to Daily
213. Korean Dermatological Association — Adult acne (Korean)Institutional
     Cited in: Closed Comedones: A 4-Week Count Map for Forehead, Cheeks, and Chin, How to Get Better Skin by Charting Bedtime, Meals, Stress Weekly, Adult Acne: Did It Carry Over From Your Teens or Start Fresh?, Stress Acne in Exam or Deadline Week: A Routine to Start at D-7, Jawline Acne Causes: A 2-Week Log for Period, Shave and Mask Days, Acne Before Period: Adjusting Skincare From Ovulation to Day 1, Acne Around Mouth: Cut Back One Product Every 2 Weeks, in Order, At What Age Does Acne Stop? A Decade-by-Decade Check, Teens to 40s, Acne Medication Visit: A Record Sheet to Bring to Your Dermatologist
214. Korean Dermatological Association — Basic skin care cosmetics (Korean)Institutional
     Cited in: How to Wash an Acne-Prone Face by Situation: Mornings to Gym Days
215. Korean Dermatological Association — Basic skin care products (Korean)Institutional
     Cited in: Male Acne on Shave Days and Workout Days: A Routine and Log, Foam Cleanser Switch: A 2-Week Log for Tightness and Breakouts, Blackhead Removal on Your Nose: A No-Squeeze Weekly Calendar, Oily Skin in Summer, Dry in Winter: Split Care by Face Zone, Clay Mask Night Routine: 30-Minute Steps and a Monthly Calendar, Dehydrated Oily Skin: What to Layer After Toner, Zone by Zone
216. Korean Dermatological Association — Basic skincare cosmetics (Korean)Institutional
     Cited in: Sheet Mask Every Day? The 5 Minutes After You Peel It Off, How Often to Wash Your Face: Track Tightness and Shine for 1 Week, Skip Toner and Use Only Lotion? Run a 2-Week Step-Removal Test, Nose Sebum Smell: A One-Week Log of Washing and Daily Habits
217. Korean Dermatological Association — Basic skincare products (Korean)Institutional
     Cited in: Moisturizer for Acne-Prone Skin: How Much in Summer, Winter, on Meds, Skincare Routine Order: Where to Slot a New Product, How Long to Wait, Dehydrated Oily Skin? Log Tightness and Shine at 3 Times of Day, How Often Should You Exfoliate Your Face? A First-Month Weekly Plan, How to Use Toner by Situation: Pat, Swipe or Soaked-Pad Mask, Aloe Vera Gel First Use: A 3-Step Patch Test and Summer Storage, Ceramide Cream Too Heavy? Try Lotion, Toner or Ampoule Textures, Cica Cream: Reading the Centella Label and When to Start or Stop, How to Layer Hyaluronic Acid: How Many Coats for a Dry Room
218. Korean Dermatological Association — Cheilitis (Korean)Institutional
     Cited in: Acne Around Mouth: Cut Back One Product Every 2 Weeks, in Order, Pimple on Lip Keeps Coming Back? Swap Lip Products, Track Habits
219. Korean Dermatological Association — Chemical peeling (Korean)Institutional
     Cited in: AHA BHA in Your First 2 Weeks: Day-by-Day Plan and Stop Signs
220. Korean Dermatological Association — Contact dermatitis (Korean)Institutional
     Cited in: Damaged Skin Barrier: What to Stop and Keep in the First 3 Days, How to Calm Irritated Skin After New Products, Masks or Periods, Aloe Vera Gel First Use: A 3-Step Patch Test and Summer Storage, Cica Cream: Reading the Centella Label and When to Start or Stop, How to Use Panthenol Cream the Day After Exfoliating or Shaving, Does Tea Tree Oil Go Bad? Storage, Oxidation, and an Arm Test Log
221. Korean Dermatological Association — Cosmetics overview and adverse effects (Korean)Institutional
     Cited in: Skin Breakout From a New Product? Pause, Then Add Back One by One, Acne Between Eyebrows: What to Watch for 3 Days After Grooming
222. Korean Dermatological Association — Cosmetics overview and adverse reactions (Korean)Institutional
     Cited in: Skincare Routine Order: Where to Slot a New Product, How Long to Wait, Acne Cream Trial: How to Log a New Cream Over the First 4 Weeks, Sensitive Skin and a New Product: 7 Days From Arm Test to Face, Soothing Ingredients by Situation: Red Days, Shaving, Exfoliation, Toner Pads: How Many Swipes, How Long to Leave On, How Often, Closed Comedones Routine: Fewer Steps, Then Watch for 4 Weeks
223. Korean Dermatological Association — Dandruff (Korean)Institutional
     Cited in: Scalp Pimples: Checking Wash Time, Rinsing and Drying Habits
224. Korean Dermatological Association — Dermatologic therapies: functional cosmetics (Korean)Institutional
     Cited in: How Often Should You Exfoliate Your Face? A First-Month Weekly Plan, Large Pores: An 8-Week Photo Log to Keep Before Trying Anything, Niacinamide Morning or Night: Weekly Vitamin C and Retinol Plan, PDRN Serum Before and After: A 4-Week Photo and Reaction Log, Retinol Schedule for Beginners: 8 Weeks From Twice a Week to Daily, How to Store Vitamin C Serum, Read Its Label, and Spot Oxidation
225. Korean Dermatological Association — Epidermal cyst (Korean)Institutional
     Cited in: Nodular Acne: What to Log and Ask Before a Dermatology Visit
226. Korean Dermatological Association — Epidermoid cyst (Korean)Institutional
     Cited in: Ear Acne: Check Earbuds, Earrings, and Your Phone in This Order
227. Korean Dermatological Association — Folliculitis (Korean)Institutional
     Cited in: Male Acne on Shave Days and Workout Days: A Routine and Log, Folliculitis vs Acne: A Few-Day Log Before Any Ointment Hunt, Butt Acne on Sitting Days vs. Workout Days: Underwear and Showers, Folliculitis After Shaving or a Hot Tub: What to Watch for 2 Days
228. Korean Dermatological Association — Melasma (Korean)Institutional
     Cited in: Sunscreen Breakouts: Test a New One From Jawline to Half-Face, How Long Acne Marks Last: Red vs. Brown, Tracked in Monthly Photos, Melasma vs Hyperpigmentation vs Sun Spots: Notes Before Any Cream, Skin Problems During Pregnancy: Adjust Your Routine by Trimester
229. Korean Dermatological Association — Melasma (Korean)Institutional
     Cited in: Hyperpigmentation: Is It Fading? A Sunscreen and Monthly Photo Log
230. Korean Dermatological Association — Miliaria (heat rash) (Korean)Institutional
     Cited in: Neck Acne: Reset What Touches Your Neck and How Far You Rinse
231. Korean Dermatological Association — Moisturizers (Korean)Institutional
     Cited in: Flaky Skin on Face? Change Your Washing Habits Over 7 Days First, Dehydrated Oily Skin: What to Layer After Toner, Zone by Zone, Moisturizer After Washing Your Face: When, How Much, How Often
232. Korean Dermatological Association — Rosacea (Korean)Institutional
     Cited in: Acne on Nose: Log Pore Strips, Glasses Pads and Nose Blowing
233. Korean Dermatological Association — Skin care (Korean)Institutional
     Cited in: Oily Skin Routine by Time of Day: Morning, Midday and Night, Dehydrated Oily Skin: What to Layer After Toner, Zone by Zone, Moisturizer After Washing Your Face: When, How Much, How Often
234. Korean Dermatological Association — Sunscreens (Korean)Institutional
     Cited in: Maskne on Long Mask Days: A Swap, Break and Moisturizer Schedule, Mineral or Chemical Sunscreen: How Much, How Early, When to Reapply, Hyperpigmentation: Is It Fading? A Sunscreen and Monthly Photo Log
235. Korean Dermatological Association — Tinea versicolor (Korean)Institutional
     Cited in: Malassezia Folliculitis in Sweaty Months: Shower & Clothes Log
236. Lactic acid isomer lotions and stratum corneum ceramides, 1996 (PMID 8818186)A
     Cited in: How Often Should You Exfoliate Your Face? A First-Month Weekly Plan
237. Lecithin-glycolic acid biphasic serum: 2-week split-face trial, 37 adults, 2026 (PMID 41987370)A
     Cited in: How Often Should You Exfoliate Your Face? A First-Month Weekly Plan
238. Less rubbing during makeup removal and facial skin condition in 35 women, 2021 (PMID 33040474)B
     Cited in: Double Cleanse Sunscreen Days: Oil, Balm or Water as Step One?
239. Licochalcone A formulation and post-shave irritation and UV redness, 2006 (PMID 16552540)A
     Cited in: Male Acne on Shave Days and Workout Days: A Routine and Log
240. Licochalcone A formulations from licorice and redness after shaving and UV exposure, 2006 (PMID 16552540)A
     Cited in: Soothing Ingredients by Situation: Red Days, Shaving, Exfoliation
241. Lifestyle, mental health and adult acne in 11,922 Chinese adults, cross-sectional study, 2026 (PMID 41657271)B
     Cited in: Acne and Sleep: A Night Routine for Weeks You Stay Up Late
242. Limonene and linalool hydroperoxide content in 104 consumer products, 2019 (PMID 30905868)C
     Cited in: Does Tea Tree Oil Go Bad? Storage, Oxidation, and an Arm Test Log
243. Long-term face mask wearing and the skin barrier: split-face RCT of a moisturizer, 21 women, 2023 (PMID 36428277)A
     Cited in: Moisturizer for Acne-Prone Skin: How Much in Summer, Winter, on Meds
244. Low-molecular-weight collagen peptide intake RCT, 70 adults, 8 weeks plus 2-week washout, 2025 (PMID 40935395)A
     Cited in: Large Pores: An 8-Week Photo Log to Keep Before Trying Anything
245. Maintaining skin health in older people: systematic review of 63 studies, 2020 (PMID 31945604)A
     Cited in: Flaky Skin on Face? Change Your Washing Habits Over 7 Days First
246. Makeup use and quality of life in female acne patients, 18 women, 2–4 weeks, 2005 (PMID 16048760)B
     Cited in: How to Wear Makeup on a Breakout Day: Cover, Touch Up, Take It Off
247. Makeup use and quality of life in women with acne, 18 participants, 2005 (PMID 16048760)B
     Cited in: Pimple Before a Big Event? A 48-Hour Step-by-Step Timeline
248. Malassezia folliculitis co-occurring in 217 patients with acne, 2018 (PMID 29911526)B
     Cited in: Malassezia Folliculitis in Sweaty Months: Shower & Clothes Log
249. Mask wearing and acne among health care workers during COVID-19, 2021 (PMID 34675578)B
     Cited in: Maskne on Long Mask Days: A Swap, Break and Moisturizer Schedule
250. Mask-induced facial skin conditions in the Saudi population, 2022 (PMID 36483886)B
     Cited in: Maskne on Long Mask Days: A Swap, Break and Moisturizer Schedule
251. Measuring the thickness of sunscreen actually applied, 52 people, 2015 (PMID 25771707)B
     Cited in: Sunscreen Breakouts: Test a New One From Jawline to Half-Face
252. Meta-analysis of 6 randomized trials with 673 melasma patients, 2023 (PMID 37457606)A
     Cited in: Melasma vs Hyperpigmentation vs Sun Spots: Notes Before Any Cream
253. Meta-analysis of acne scar prevalence and risk factors, 37 studies, 24,649 people, 2023 (PMID 37357642)A
     Cited in: Nodular Acne: What to Log and Ask Before a Dermatology Visit
254. Meta-analysis of contact allergy prevalence in the general population, 28 studies and 20,107 people, 2019 (PMID 30370565)A
     Cited in: Pimple on Lip Keeps Coming Back? Swap Lip Products, Track Habits
255. Meta-analysis of hair product ingredients and contact allergy, 70 studies, 2022 (PMID 35805241)A
     Cited in: Scalp Pimples: Checking Wash Time, Rinsing and Drying Habits
256. Meta-analysis of irritation and sensitization from oxybenzone sunscreens, 64 human studies and 19,570 exposures, 2008 (PMID 18717962)A
     Cited in: Sunscreen Breakouts: Test a New One From Jawline to Half-Face
257. Meta-analysis of LED devices across skin conditions, 31 studies, 2023 (PMID 36310510)A
     Cited in: Pore Device Use Log: What to Record and When to Take a Break
258. Meta-analysis of scar prevalence and risk factors in acne patients, 37 studies and 24,649 people, 2023 (PMID 37357642)A
     Cited in: Acne Scar Cream? First Sort Your Scar Types and Prep for a Consult
259. Meta-analysis of scar prevalence and risk factors in people with acne, 2023 (PMID 37357642)A
     Cited in: Acne Scars: What to Watch for 3 Months After a Breakout Settles
260. Meta-analysis of scar prevalence and risk factors in people with acne, 37 studies, 24,649 people, 2023 (PMID 37357642)A
     Cited in: Pustules: What to Do and What to Skip in the First 3 Days
261. Meta-analysis of topical hydrogel formulations, 13 trials, 3,654 participants, 2026 (PMID 41528187)A
     Cited in: Pimple Before a Big Event? A 48-Hour Step-by-Step Timeline
262. Micro-scratches on eyeglass frames and allergic contact reactions, 2013 (PMID 23717004)B
     Cited in: Temple Acne: Rinsing the Side of Your Face and Wiping Glasses Arms
263. Mineral water and probiotic product in 20 mask-wearing people with rosacea or sensitive skin: half-face RCT, 2023 (PMID 36660190)A
     Cited in: How to Calm Irritated Skin After New Products, Masks or Periods
264. Moisturizing cream in 90 adults with oily skin: 4-week randomized trial measuring sebum, hydration, and water loss, 2023 (PMID 37194909)A
     Cited in: Dehydrated Oily Skin? Log Tightness and Shine at 3 Times of Day
265. Moisturizing right after washing vs. 30 minutes later, 60 people, 2022 (PMID 35435321)B
     Cited in: How to Wash an Acne-Prone Face by Situation: Mornings to Gym Days
266. Multicenter epidemiology of acne in Korea (1,236 patients), 2011 (PMID 21595660)B
     Cited in: Acne and Sleep: A Night Routine for Weeks You Stay Up Late, Acne Before Period: Adjusting Skincare From Ovulation to Day 1
267. Multicenter epidemiology of acne in Korean patients: 1,236 patients at 17 hospitals, 2011 (PMID 21595660)B
     Cited in: Acne Location Meaning: What 2 Weeks of Breakout Notes Can Show
268. Multicenter epidemiology of acne in Korean patients: 1,236 patients, 2011 (PMID 21595660)B
     Cited in: Cheek Acne Causes: A 4-Week Order for Dry, Sensitive Cheeks
269. Multicenter RCT of a three-product defensin skin care regimen, 44 women, 12 weeks, 2018 (PMID 29601620)A
     Cited in: Large Pores: An 8-Week Photo Log to Keep Before Trying Anything
270. Myrtle extract and azelaic acid dermocosmetic in the maintenance phase of adult female acne, 2023 (PMID 36729399)A
     Cited in: Azelaic Acid, the First 4 Weeks: A Sting Log and Split Schedule
271. Network meta-analysis of 179 acne RCTs, 2022 (PMID 35789996)A
     Cited in: Acne Care Plan at Home: What to Check at 2, 6, and 12 Weeks
272. Network meta-analysis of 23 randomized trials (3,905 people) of topical agents for photoaging, 2025 (PMID 40707570)A
     Cited in: Retinol Schedule for Beginners: 8 Weeks From Twice a Week to Daily
273. NHS 111 Wales — Health A-Z: Acne (updated 2024-11-07)Institutional
     Cited in: Skin Problems During Pregnancy: Adjust Your Routine by Trimester
274. Niacinamide 4% cream in 27 women with facial pigment patches, 8-week left-right comparison, 2011 (PMID 21822427)A
     Cited in: Niacinamide Morning or Night: Weekly Vitamin C and Retinol Plan
275. Niacinamide and glycerin body lotion and stratum corneum barrier: two RCTs, 63 and 58 people, 2012 (PMID 22206073)A
     Cited in: How to Use Toner by Situation: Pat, Swipe or Soaked-Pad Mask
276. Niacinamide-containing sunscreen and post-inflammatory hyperpigmentation, randomized trial in 20 people, 2026 (PMID 41240206)A
     Cited in: Hyperpigmentation: Is It Fading? A Sunscreen and Monthly Photo Log
277. Niacinamide-peptide cosmetic routine vs prescription tretinoin over 8 weeks, randomized trial in 196 women, 2010 (PMID 20374604)A
     Cited in: Niacinamide Morning or Night: Weekly Vitamin C and Retinol Plan
278. NIAMS — Acne: Diagnosis, Treatment, and Steps to Take (reviewed 2023-07)Institutional
     Cited in: Male Acne on Shave Days and Workout Days: A Routine and Log
279. Non-inferiority RCT of whey protein intake and acne in men, 49 people, 2024 (PMID 38291989)A
     Cited in: Supplements for Acne: A 12-Week Log and When to Stop Taking Them
280. Oat and aloe moisturizer vs. metronidazole cream: randomized trial, 2026 (PMID 42163060)A
     Cited in: Aloe Vera Gel First Use: A 3-Step Patch Test and Summer Storage
281. Objective assessment of sensitive skin by skin type (lactic acid sting test), 2020 (PMID 32726552)A
     Cited in: Sensitive Skin and a New Product: 7 Days From Arm Test to Face
282. Occupational facial skin conditions from mask use in health care workers, 2022 (PMID 34450685)B
     Cited in: Maskne on Long Mask Days: A Swap, Break and Moisturizer Schedule
283. OCT imaging of skin changes after electric shaving, 10 men, 2024 (PMID 38951871)B
     Cited in: Male Acne on Shave Days and Workout Days: A Routine and Log
284. Open split-face study of menstrual-related acne (35 women), 2004 (PMID 15536660)B
     Cited in: Acne Before Period: Adjusting Skincare From Ovulation to Day 1
285. Optimal moisturizer application based on skin physiology, 2022 (PMID 34743412)B
     Cited in: Flaky Skin on Face? Change Your Washing Habits Over 7 Days First, Dehydrated Oily Skin: What to Layer After Toner, Zone by Zone, Moisturizer After Washing Your Face: When, How Much, How Often
286. Oral supplements and skin hydration, meta-analysis of 66 RCTs with 4,090 participants, 2022 (PMID 35719159)A
     Cited in: How to Layer Hyaluronic Acid: How Many Coats for a Dry Room
287. Panthenol 0.5%, 1.0%, and 5.0% formulations, hydration and TEWL clinical study, 2011 (PMID 21982351)B
     Cited in: How to Use Panthenol Cream the Day After Exfoliating or Shaving
288. Panthenol and madecassoside moisturizer and recovery after fractional laser, 20 people, 2019 (PMID 30945430)A
     Cited in: Soothing Ingredients by Situation: Red Days, Shaving, Exfoliation
289. Panthenol and madecassoside moisturizing cream: half-face comparison, 2019 (PMID 30945430)A
     Cited in: Cica Cream: Reading the Centella Label and When to Start or Stop
290. Panthenol and niacinamide product on one leg in 35 people with dry, sensitive skin, 28-day randomized trial, 2026 (PMID 42108609)A
     Cited in: How to Use Panthenol Cream the Day After Exfoliating or Shaving
291. Panthenol mask in 177 people with three subtypes of impaired skin barrier, 14-day clinical study, 2024 (PMID 38366684)B
     Cited in: How to Use Panthenol Cream the Day After Exfoliating or Shaving
292. Patch test analysis of 2,331 patients with scalp symptoms (1996–2016), 2021 (PMID 32822786)B
     Cited in: Scalp Pimples: Checking Wash Time, Rinsing and Drying Habits
293. Patch test concentrations of ascaridole, a component of oxidized tea tree oil, 319 people, 2014 (PMID 24645715)B
     Cited in: Does Tea Tree Oil Go Bad? Storage, Oxidation, and an Arm Test Log
294. Patch test reactions to mineral powder in 23 nickel-sensitized people, 2012 (PMID 22404196)B
     Cited in: Pore Primer Days: Afternoon Touch-Ups to Evening Removal
295. Patch testing to glucoside surfactants, North American Contact Dermatitis Group, 24,097 patients, 2022 (PMID 35551968)B
     Cited in: Foam Cleanser Switch: A 2-Week Log for Tightness and Breakouts
296. Pathogenesis of adult female acne: review of 20 studies, 2025 (PMID 40309637)A
     Cited in: Acne Diet Changes: Swap One Food at a Time and Log It for 4 Weeks
297. Pathogenesis of adult female acne: systematic review of 20 studies, 2025 (PMID 40309637)A
     Cited in: Adult Acne: Did It Carry Over From Your Teens or Start Fresh?
298. PDRN and cultured human skin fibroblasts, 1997 (PMID 9104493)C
     Cited in: PDRN Serum Before and After: A 4-Week Photo and Reaction Log
299. PDRN ointment at skin graft donor sites in 40 patients, preliminary study, 2004 (PMID 15025849)B
     Cited in: PDRN Serum Before and After: A 4-Week Photo and Reaction Log
300. Periorbital dermatitis: 10 years of patch test results in 4,779 patients, 2014 (PMID 24325408)B
     Cited in: Acne Between Eyebrows: What to Watch for 3 Days After Grooming
301. pH analysis of 96 cleansing products for children's or sensitive skin, 2025 (PMID 41417527)B
     Cited in: Low pH Cleanser Switch: A 2-Week Log for Tightness and Redness
302. Pilot randomized trial of post-exercise shower timing and truncal acne, 23 participants, 2008 (PMID 18304176)A
     Cited in: Malassezia Folliculitis in Sweaty Months: Shower & Clothes Log
303. Pilot study of squalene peroxidation in acne-prone skin, 2023 (PMID 38139830)B
     Cited in: Nose Sebum Smell: A One-Week Log of Washing and Daily Habits
304. Placebo-controlled trial of dexpanthenol 5% for protection against skin irritation, 25 people, 2003 (PMID 14641355)A
     Cited in: Soothing Ingredients by Situation: Red Days, Shaving, Exfoliation
305. Post-exercise shower timing and truncal acne, pilot RCT in 23 men, 2008 (PMID 18304176)A
     Cited in: Male Acne on Shave Days and Workout Days: A Routine and Log
306. Pre-applying dexpanthenol 5% and SLS irritation, placebo-controlled trial in 25 healthy people, 2003 (PMID 14641355)A
     Cited in: How to Use Panthenol Cream the Day After Exfoliating or Shaving
307. Pregnancy outcomes in 79 women exposed to isotretinoin, 2012 (PMID 23116253)B
     Cited in: Skin Problems During Pregnancy: Adjust Your Routine by Trimester
308. Prescription combination gel in 2,453 adolescents aged 12–17: subgroup analysis, 2010 (PMID 21061762)A
     Cited in: Teen Acne on School Days: Before Class, After Gym, During Exams
309. Prevalence and severity of truncal acne in 696 US acne patients, 2007 (PMID 17668525)B
     Cited in: Back Acne Body Wash: Workout Shower Order and a 4-Week Photo Log
310. Prevalence of contact allergy in the general population: meta-analysis of 28 studies, 20,107 people, 2019 (PMID 30370565)A
     Cited in: Ear Acne: Check Earbuds, Earrings, and Your Phone in This Order
311. Prevalence of contact allergy in the general population: meta-analysis of 28 studies, 2019 (PMID 30370565)A
     Cited in: Skin Breakout From a New Product? Pause, Then Add Back One by One
312. Prevalence of Malassezia folliculitis among dermatology outpatients in Urumqi, China, 2008 (PMID 18386158)B
     Cited in: Malassezia Folliculitis in Sweaty Months: Shower & Clothes Log
313. Prevalence of stress, depression and anxiety in skin disease: meta-analysis of 113 studies, 2024 (PMID 38822990)A
     Cited in: How to Get Better Skin by Charting Bedtime, Meals, Stress Weekly
314. Preventing and managing topical retinoid irritation, Delphi consensus of 133 dermatologists, 2024 (PMID 38972576)A
     Cited in: Retinol Schedule for Beginners: 8 Weeks From Twice a Week to Daily
315. Pseudo-ceramide spray in women with dry, sensitive skin: 4-week randomized trial, 2025 (PMID 39492723)A
     Cited in: Ceramide Cream Too Heavy? Try Lotion, Toner or Ampoule Textures
316. Psychosocial impact of acne in 1,443 Japanese adolescents, 2010 (PMID 20629827)B
     Cited in: Stress Acne in Exam or Deadline Week: A Routine to Start at D-7
317. Psychosocial impact of acne in Japanese adolescents, survey of 1,443, 2010 (PMID 20629827)B
     Cited in: Butt Acne on Sitting Days vs. Workout Days: Underwear and Showers
318. Quality of life after medical camouflage makeup training, 86 participants, 1 month, 2012 (PMID 22759904)B
     Cited in: How to Wear Makeup on a Breakout Day: Cover, Touch Up, Take It Off
319. Quality of life with azelaic acid 15% gel vs. an oral medicine in adult female acne, 2024 (PMID 39444646)A
     Cited in: Azelaic Acid, the First 4 Weeks: A Sting Log and Split Schedule
320. Randomized controlled trial of hydration after a single application of lamellar moisturizers, 30 participants, 2020 (PMID 32167240)A
     Cited in: Dehydrated Oily Skin: What to Layer After Toner, Zone by Zone
321. Randomized trial adding cognitive behavioral therapy in 32 people with acne excoriée, 2022 (PMID 32502358)A
     Cited in: Should I Pop My Pimple or Wait? A Habit Log for When Urges Strike
322. Randomized trial comparing four ways to apply a prescription acne gel in 120 people, 2018 (PMID 30187864)A
     Cited in: Acne Medication Order for Two or More Creams, and the Wait Between
323. Randomized trial in 50 adults with Malassezia folliculitis, 2024 (PMID 38979986)A
     Cited in: Folliculitis vs Acne: A Few-Day Log Before Any Ointment Hunt
324. Randomized trial of 50 patients with Malassezia folliculitis (microscopy-negative rate), 2024 (PMID 38979986)A
     Cited in: Malassezia Folliculitis in Sweaty Months: Shower & Clothes Log
325. Randomized trial of blue light-induced pigmentation in 33 women, 2020 (PMID 32478879)A
     Cited in: How Long Acne Marks Last: Red vs. Brown, Tracked in Monthly Photos
326. Randomized trial of in-office lesion extraction in 128 people with moderate acne, 2021 (PMID 34804358)A
     Cited in: Should I Pop My Pimple or Wait? A Habit Log for When Urges Strike
327. Randomized trial of lipohydroxy acid peels vs. salicylic acid peels in comedonal acne, 20 patients, 2011 (PMID 21896127)A
     Cited in: Closed Comedones Routine: Fewer Steps, Then Watch for 4 Weeks
328. Randomized trial of scalp barrier and inflammation markers after anti-dandruff shampoo use, 2011 (PMID 21182510)A
     Cited in: Scalp Pimples: Checking Wash Time, Rinsing and Drying Habits
329. Randomized trial of skin care and makeup coaching and quality of life in 50 women with acne, 2006 (PMID 17073988)A
     Cited in: Acne Cream Trial: How to Log a New Cream Over the First 4 Weeks
330. Randomized trial of skin care and makeup instruction for women with acne, 50 participants, 2006 (PMID 17073988)A
     Cited in: Pimple Before a Big Event? A 48-Hour Step-by-Step Timeline
331. Randomized trial of skin irritation when a prescription gel is used with a moisturizer in 120 Asian patients, 2016 (PMID 26293170)A
     Cited in: Acne Medication Order for Two or More Creams, and the Wait Between
332. RCT comparing application timing of two prescription topicals, 247 people, 2010 (PMID 20677537)A
     Cited in: Acne Cream, First 2 Weeks: Logging Amount, Area, and Stinging
333. RCT comparing irritation of skincare routines used with prescription topicals, 88 people, 2024 (PMID 38102855)A
     Cited in: Acne Medication Visit: A Record Sheet to Bring to Your Dermatologist
334. RCT comparing water-only washing and cleanser use in summer, 43 children, 2024 (PMID 38310043)A
     Cited in: How to Wash an Acne-Prone Face by Situation: Mornings to Gym Days
335. RCT of 12 weeks of Lactobacillus CJLP55 intake for acne, 28 people, 2021 (PMID 33921829)A
     Cited in: Supplements for Acne: A 12-Week Log and When to Stop Taking Them
336. RCT of a cream alone vs. cream plus prebiotic supplement in adult women with acne, 184 people, 2022 (PMID 35545875)A
     Cited in: Supplements for Acne: A 12-Week Log and When to Stop Taking Them
337. RCT of fractional laser for atrophic acne scars, 13 people, 2012 (PMID 22766970)A
     Cited in: Acne Scar Cream? First Sort Your Scar Types and Prep for a Consult
338. RCT of hydration after one application of lamellar moisturizers, 30 adults, 2020 (PMID 32167240)A
     Cited in: Moisturizer After Washing Your Face: When, How Much, How Often
339. RCT of omega-3 and gamma-linolenic acid intake for acne, 45 people, 2014 (PMID 24553997)A
     Cited in: Supplements for Acne: A 12-Week Log and When to Stop Taking Them
340. RCT of skin care and makeup coaching and quality of life in women with acne, 2006 (PMID 17073988)A
     Cited in: Acne Severity: Count Your Spots at the Mirror and Log Each Week
341. Real-use skin evaluation of four soaps on the forearm: 60 people, 2022 (PMID 34741581)B
     Cited in: Flaky Skin on Face? Change Your Washing Habits Over 7 Days First
342. Reassessing the comedogenicity concept: 4-week patch test of finished products, 6 people, 2006 (PMID 16488305)B
     Cited in: Pore Primer Days: Afternoon Touch-Ups to Evening Removal
343. Regional characteristics of oily skin assessed by imaging techniques, 19 people, 2019 (PMID 30971936)B
     Cited in: Large Pores: An 8-Week Photo Log to Keep Before Trying Anything
344. Repeated friction and decreased serine and lactic acid in the stratum corneum, 6 people, 2018 (PMID 29243811)B
     Cited in: Toner Pads: How Many Swipes, How Long to Leave On, How Often
345. Repeated friction and loss of stratum corneum components, 2018 (PMID 29243811)B
     Cited in: Flaky Skin on Face? Change Your Washing Habits Over 7 Days First
346. Repeated friction washing and changes in stratum corneum components, 6 participants, 2018 (PMID 29243811)B
     Cited in: Cleansing Cream: When to Use It, by How Much Makeup You Wear, Cleansing Oil: A 3-Minute Routine for Emulsifying and Rinsing
347. Repeated friction washing and loss of stratum corneum components, 2018 (PMID 29243811)B
     Cited in: Temple Acne: Rinsing the Side of Your Face and Wiping Glasses Arms, Dark Spots on Buttocks? Track Sitting Hours, Clothes and Scrubbing
348. Repeated friction washing and loss of stratum corneum components: 6 healthy adults, 2018 (PMID 29243811)B
     Cited in: Back Acne Shower Routine: A Week of Wash Order, Sweat, Clothes
349. Repeated open application test of oxidized limonene, 11 allergic people and 17 controls, 2019 (PMID 30378136)A
     Cited in: Does Tea Tree Oil Go Bad? Storage, Oxidation, and an Arm Test Log
350. Repeated SLS application and cumulative irritation in 11 people, 1994 (PMID 8088139)A
     Cited in: Skip Toner and Use Only Lotion? Run a 2-Week Step-Removal Test
351. Repeated washing with an automated cleansing device and workplace skin cleanser irritation, 25 people, 2014 (PMID 24588368)B
     Cited in: Pore Device Use Log: What to Record and When to Take a Break
352. Response to SLS irritation after 4 weeks of four 8% AHAs, 11 adults, 1997 (PMID 9470910)A
     Cited in: How Often Should You Exfoliate Your Face? A First-Month Weekly Plan
353. Retinaldehyde 0.1% and 0.05% cream in 40 Korean women, 3-month randomized trial, 2018 (PMID 29663701)A
     Cited in: Retinol Schedule for Beginners: 8 Weeks From Twice a Week to Daily
354. Retinol 0.5% plus vitamin C 30% used together, 12-week trial in 44 women, 2016 (PMID 27050703)B
     Cited in: How to Layer Hyaluronic Acid: How Many Coats for a Dry Room
355. Review of Pseudomonas aeruginosa skin infections, 1984 (PMID 6229990)B
     Cited in: Folliculitis After Shaving or a Hot Tub: What to Watch for 2 Days
356. Review of the causes of acne in adult women, 20 studies, 2025 (PMID 40309637)A
     Cited in: At What Age Does Acne Stop? A Decade-by-Decade Check, Teens to 40s
357. Rinse-off products and photo-oxidation of skin-surface vitamin E and squalene in 13 people, 2005 (PMID 15608499)A
     Cited in: Nose Sebum Smell: A One-Week Log of Washing and Daily Habits
358. Risk factors for acne keloidalis nuchae in Black patients, case-control study of 303, 2020 (PMID 32081453)B
     Cited in: Folliculitis After Shaving or a Hot Tub: What to Watch for 2 Days
359. Risk factors for acne keloidalis nuchae in Black patients, case-control study, 2020 (PMID 32081453)B
     Cited in: Pimples on Back of Neck: A 2-Week Haircut, Ponytail, Collar Log
360. Risk factors for acne scarring in 225 patients in Thailand, 2025 (PMID 39601200)B
     Cited in: How to Remove Sebum from Your Face? Track Your Shine for 2 Weeks First
361. Risk factors for facial acne scarring among 225 Thai patients, 2025 (PMID 39601200)B
     Cited in: Pimple Patch Log: What to Watch From Day 1 Night to Day 3
362. Risk factors for mask-related breakouts: survey of 227 health care workers, 2023 (PMID 36357553)B
     Cited in: Closed Comedones: A 4-Week Count Map for Forehead, Cheeks, and Chin
363. Risk factors for post-acne hyperpigmentation, 2021 (PMID 34880967)B
     Cited in: How Long Acne Marks Last: Red vs. Brown, Tracked in Monthly Photos, Dark Spots on Buttocks? Track Sitting Hours, Clothes and Scrubbing, Hyperpigmentation: Is It Fading? A Sunscreen and Monthly Photo Log
364. Rubbing during makeup removal and facial skin condition, 35 women, 4 weeks, 2021 (PMID 33040474)B
     Cited in: How to Wear Makeup on a Breakout Day: Cover, Touch Up, Take It Off
365. Safe range for primary irritation from cosmetic patch tests in 7,440 Korean women, 2014 (PMID 24117720)B
     Cited in: Skin Breakout From a New Product? Pause, Then Add Back One by One
366. Safe ranges for primary irritation in cosmetic patch tests of 7,440 Korean women, 2014 (PMID 24117720)B
     Cited in: Acne Cream Trial: How to Log a New Cream Over the First 4 Weeks
367. Salicylic acid 1–2% cleanser and lotion combination vs a prescription comparator, 12-week randomized trial, 54 participants, 2025 (PMID 39301780)A
     Cited in: Salicylic Acid for Beginners: Your First 2 Weeks, Day by Day
368. Salicylic acid and niacinamide cream as adjunct and maintenance use, randomized trial, 100 participants, 2023 (PMID 38051857)A
     Cited in: Salicylic Acid for Beginners: Your First 2 Weeks, Day by Day
369. Salicylic acid combination cream, 56-day randomized comparison, 150 participants, 2024 (PMID 37941097)A
     Cited in: Salicylic Acid for Beginners: Your First 2 Weeks, Day by Day
370. Season, body site and lifestyle factors affecting skin sensitivity assessment, 24 people, 2020 (PMID 31498557)B
     Cited in: How to Calm Irritated Skin After New Products, Masks or Periods
371. Season, climate, air pollution and transepidermal water loss, systematic review of 15 human studies, 2022 (PMID 35677917)A
     Cited in: Oily Skin in Summer, Dry in Winter: Split Care by Face Zone
372. Seasonal changes in facial skin with and without acne (17 teens, 1 year), 2015 (PMID 26091385)B
     Cited in: Oily Skin Routine by Time of Day: Morning, Midday and Night
373. Seasonal changes in facial skin with and without acne, 17 participants over one year, 2015 (PMID 26091385)B
     Cited in: Dehydrated Oily Skin: What to Layer After Toner, Zone by Zone
374. Seasonal changes in facial skin with and without acne, 2015 (PMID 26091385)B
     Cited in: Clay Mask Night Routine: 30-Minute Steps and a Monthly Calendar, Acne Between Eyebrows: What to Watch for 3 Days After Grooming, Forehead Acne Causes: Wash Order for Bangs and Hat Days
375. Seasonal changes in facial skin with and without acne, measured monthly for 1 year, 2015 (PMID 26091385)B
     Cited in: Large Pores: An 8-Week Photo Log to Keep Before Trying Anything
376. Seasonal tolerability of a prescription retinoid lotion: post hoc analysis, 1,614 participants, 2023 (PMID 37720201)B
     Cited in: Moisturizer for Acne-Prone Skin: How Much in Summer, Winter, on Meds
377. Sebum cleansing with a monofilament cleansing pad on acne-prone skin, 7 people, 2019 (PMID 31721661)B
     Cited in: Toner Pads: How Many Swipes, How Long to Leave On, How Often
378. Sebum secretion patterns in young women with and without acne, 1991 (PMID 1835938)B
     Cited in: Acne on Nose: Log Pore Strips, Glasses Pads and Nose Blowing, Oily Skin Routine by Time of Day: Morning, Midday and Night
379. Sebum, pH, hydration and Demodex in acne and rosacea patients, 2017 (PMID 29035242)B
     Cited in: Folliculitis After Shaving or a Hot Tub: What to Watch for 2 Days
380. Sedentary lifestyle, sleep and acne in 11,922 Chinese adults, 2026 (PMID 41657271)B
     Cited in: How to Get Better Skin by Charting Bedtime, Meals, Stress Weekly
381. Self-excoriation and psychological factors in 56 women with acne, 1996 (PMID 8742540)B
     Cited in: Should I Pop My Pimple or Wait? A Habit Log for When Urges Strike
382. Self-perceived skin type and sebum levels in 709 acne patients, 2013 (PMID 23279191)B
     Cited in: Pore Primer Days: Afternoon Touch-Ups to Evening Removal
383. Sensitive skin and sleep, fatigue, dust, sweat and female hormonal changes: survey of 10,743 people, 2021 (PMID 33561893)B
     Cited in: How to Calm Irritated Skin After New Products, Masks or Periods
384. Seoul National University Hospital N Medical Information — Acne (Korean)Institutional
     Cited in: Blackhead Removal on Your Nose: A No-Squeeze Weekly Calendar, Pore Primer Days: Afternoon Touch-Ups to Evening Removal
385. Seoul National University Hospital, N Medical Information — Acne (Korean)Institutional
     Cited in: Back Acne Body Wash: Workout Shower Order and a 4-Week Photo Log, How to Remove Sebum from Your Face? Track Your Shine for 2 Weeks First
386. Serum with 5% niacinamide, left-right forehead comparison, 4-week randomized pilot trial, 25 participants, 2024 (PMID 39768384)A
     Cited in: Niacinamide Morning or Night: Weekly Vitamin C and Retinol Plan
387. Short patch test protocol for assessing immediate skin reactions, 2020 (PMID 32279349)A
     Cited in: Sensitive Skin and a New Product: 7 Days From Arm Test to Face
388. Signs of androgen excess across life stages in a US digital cohort, 2025 (PMID 39388314)B
     Cited in: Jawline Acne Causes: A 2-Week Log for Period, Shave and Mask Days
389. Site differences in nonimmunologic contact urticaria on the scalp, face and back, 2012 (PMID 22093067)A
     Cited in: Temple Acne: Rinsing the Side of Your Face and Wiping Glasses Arms
390. Six hours in a low-humidity Korean winter indoor setting and a split-site moisturizing cream comparison, 2023 (PMID 37357654)A
     Cited in: How to Layer Hyaluronic Acid: How Many Coats for a Dry Room
391. Six hours in low-humidity winter indoor air and a ceramide-containing cream, split-face study in 20 Korean women, 2023 (PMID 37357654)A
     Cited in: Oily Skin in Summer, Dry in Winter: Split Care by Face Zone
392. Six hours of low-humidity indoor winter air and a moisturizing cream: split-face comparison in Korean women, 2023 (PMID 37357654)A
     Cited in: Moisturizer for Acne-Prone Skin: How Much in Summer, Winter, on Meds
393. Six-month comparative study of hypertrophic and keloid scars, 60 people, 2007 (PMID 17722521)B
     Cited in: Acne Scar Cream? First Sort Your Scar Types and Prep for a Consult
394. Six-month quality-of-life RCT of prescription topical vs. oral hormonal therapy in 38 adult women with acne, 2017 (PMID 29484094)A
     Cited in: At What Age Does Acne Stop? A Decade-by-Decade Check, Teens to 40s
395. Six-week split-face moisturizer trial in winter, 16 young women, 2003 (PMID 14571069)B
     Cited in: Oily Skin in Summer, Dry in Winter: Split Care by Face Zone
396. Skin barrier function in rosacea and perioral dermatitis, 2004 (PMID 15214900)B
     Cited in: Acne Around Mouth: Cut Back One Product Every 2 Weeks, in Order
397. Skin biophysical effects of four soaps used on the forearm, 60 adults, 2022 (PMID 34741581)B
     Cited in: Low pH Cleanser Switch: A 2-Week Log for Tightness and Redness
398. Skin changes four weeks after switching to recommended washing methods, 19 participants, 2024 (PMID 37915292)B
     Cited in: Cleansing Cream: When to Use It, by How Much Makeup You Wear
399. Skin conditions after beauty salon procedures, prospective observation of 102 patients, 2020 (PMID 33911422)B
     Cited in: Butt Acne on Sitting Days vs. Workout Days: Underwear and Showers, Folliculitis on Face? Daily Photos, Shaving Notes and Visit Prep, Folliculitis After Shaving or a Hot Tub: What to Watch for 2 Days
400. Skin conditions after beauty salon procedures: prospective study of 102 patients, 2020 (PMID 33911422)B
     Cited in: Acne Between Eyebrows: What to Watch for 3 Days After Grooming
401. Skin oxidation markers in 20 women living in a polluted area, 2019 (PMID 31213870)B
     Cited in: Nose Sebum Smell: A One-Week Log of Washing and Daily Habits
402. Skin pH after a mildly acidic cleanser vs. soap, 43 ICU adults, 2013 (PMID 23665029)B
     Cited in: Foam Cleanser Switch: A 2-Week Log for Tightness and Breakouts
403. Skin responses by sheet mask type and wear time, 2024 (PMID 38951050)A
     Cited in: How to Remove Sebum from Your Face? Track Your Shine for 2 Weeks First
404. Skin tolerability of three Dead Sea muds applied for 30 minutes, 75 women, 2018 (PMID 30311902)A
     Cited in: Clay Mask Night Routine: 30-Minute Steps and a Monthly Calendar
405. Skin toxicity of hair cosmetic ingredients, with a focus on hairdressers, review, 2022 (PMID 35805241)A
     Cited in: Pimples on Back of Neck: A 2-Week Haircut, Ponytail, Collar Log
406. Skincare ingredients before and after aesthetic procedures, international expert Delphi consensus, 2026 (PMID 42087526)A
     Cited in: Niacinamide Morning or Night: Weekly Vitamin C and Retinol Plan, Retinol Schedule for Beginners: 8 Weeks From Twice a Week to Daily
407. Sleep pattern and forehead sebum secretion in 40 healthy women, 2015 (PMID 25163854)B
     Cited in: Acne and Sleep: A Night Routine for Weeks You Stay Up Late
408. Sleep patterns and fluctuations in forehead sebum secretion, 40 women, 2015 (PMID 25163854)B
     Cited in: Large Pores: An 8-Week Photo Log to Keep Before Trying Anything
409. Sleep quality and acne severity in 40 adults, 2019 (PMID 33089183)B
     Cited in: How to Get Better Skin by Charting Bedtime, Meals, Stress Weekly
410. Sleep traits and inflammatory skin diseases, Mendelian randomization, 2025 (PMID 41050715)B
     Cited in: Acne and Sleep: A Night Routine for Weeks You Stay Up Late
411. Split-face comparison of a plant-based cleanser and an SLES cleanser on sebum and redness, 21 people, 2019 (PMID 30022595)A
     Cited in: How to Wash an Acne-Prone Face by Situation: Mornings to Gym Days
412. Split-face comparison of sunscreens after laser, 59 patients with acne and scars, 2022 (PMID 35250287)A
     Cited in: Sunscreen Breakouts: Test a New One From Jawline to Half-Face
413. Split-face randomized trial of barrier care with moisturizer before starting a prescription topical, 2006 (PMID 17121065)A
     Cited in: Acne Medication Order for Two or More Creams, and the Wait Between
414. Split-face tolerability of a prescription topical gel with vs. without a moisturizing lotion, 30 people, 2013 (PMID 22384983)A
     Cited in: Acne Cream, First 2 Weeks: Logging Amount, Area, and Stinging
415. Stabilized 12% vitamin C serum at pH 6, 8-week observational study, 80 participants, 2025 (PMID 39788601)B
     Cited in: How to Store Vitamin C Serum, Read Its Label, and Spot Oxidation
416. Standardized test of cleanser cleaning efficiency in 24 people, 2014 (PMID 24102685)A
     Cited in: Double Cleanse Sunscreen Days: Oil, Balm or Water as Step One?
417. Stratum corneum damage from adhesive dressings, RCT in 12 and 20 people, 2001 (PMID 12964220)A
     Cited in: Pimple Patch Log: What to Watch From Day 1 Night to Day 3
418. Stratum corneum hydration and percutaneous absorption before and after 30 minutes of occlusion, 8 people, 1988 (PMID 3179203)A
     Cited in: Sheet Mask Every Day? The 5 Minutes After You Peel It Off
419. Sunscreen application thickness and factors in preservative exposure, 52 people, 2015 (PMID 25771707)B
     Cited in: Mineral or Chemical Sunscreen: How Much, How Early, When to Reapply
420. Surgical outcomes of acne keloidalis nuchae, systematic review, 2025 (PMID 40117706)A
     Cited in: Pimples on Back of Neck: A 2-Week Haircut, Ponytail, Collar Log
421. Survey of acne-related post-inflammatory hyperpigmentation in the Middle East, 262 patients, 2019 (PMID 30426810)B
     Cited in: Folliculitis on Face? Daily Photos, Shaving Notes and Visit Prep
422. Survey of acne-related post-inflammatory hyperpigmentation in the Middle East, 262 people, 2019 (PMID 30426810)B
     Cited in: Pustules: What to Do and What to Skip in the First 3 Days
423. Survey of post-acne hyperpigmentation in 262 acne patients in the Middle East, 2019 (PMID 30426810)B
     Cited in: How Long Acne Marks Last: Red vs. Brown, Tracked in Monthly Photos, Nose Sebum Smell: A One-Week Log of Washing and Daily Habits
424. Survey of post-inflammatory hyperpigmentation in acne patients in the Middle East, 2019 (PMID 30426810)B
     Cited in: Acne Scars: What to Watch for 3 Months After a Breakout Settles
425. Synthesis of 20 qualitative studies on the experience of acne, 2021 (PMID 33526498)A
     Cited in: Acne Care Plan at Home: What to Check at 2, 6, and 12 Weeks
426. Systematic review and meta-analysis of hydrogel formulations for acne, 13 studies, 3,654 people, 2026 (PMID 41528187)A
     Cited in: Pustules: What to Do and What to Skip in the First 3 Days
427. Systematic review of 39 confocal microscopy and OCT imaging studies of follicle conditions, 2023 (PMID 37140216)A
     Cited in: Folliculitis vs Acne: A Few-Day Log Before Any Ointment Hunt
428. Systematic review of acne epidemiology, 2013 (PMID 23210645)A
     Cited in: At What Age Does Acne Stop? A Decade-by-Decade Check, Teens to 40s, Acne Severity: Count Your Spots at the Mirror and Log Each Week
429. Systematic review of allergic reactions to lip care cosmetics, 47 reports and 58 patients, 2024 (PMID 37904533)A
     Cited in: Pimple on Lip Keeps Coming Back? Swap Lip Products, Track Habits
430. Systematic review of confocal microscopy and OCT imaging in inflammatory follicular skin diseases, 39 studies, 2023 (PMID 37140216)A
     Cited in: Folliculitis on Face? Daily Photos, Shaving Notes and Visit Prep
431. Systematic review of drug studies for perioral dermatitis, 11 studies and 733 people, 2022 (PMID 34779023)A
     Cited in: Acne Around Mouth: Cut Back One Product Every 2 Weeks, in Order
432. Systematic review of fractional radiofrequency microneedling alone, 16 studies and 481 people, 2025 (PMID 39781098)A
     Cited in: Acne Scar Cream? First Sort Your Scar Types and Prep for a Consult
433. Systematic review of human hair lipid composition, 59 studies, 2023 (PMID 35218566)A
     Cited in: Forehead Acne Causes: Wash Order for Bangs and Hat Days
434. Systematic review of skin care for incontinence-associated skin damage in older adults, 2021 (PMID 34729012)A
     Cited in: Foam Cleanser Switch: A 2-Week Log for Tightness and Breakouts
435. Systematic review of skin care for older adults, 63 studies, 2020 (PMID 31945604)A
     Cited in: Low pH Cleanser Switch: A 2-Week Log for Tightness and Redness, Moisturizer After Washing Your Face: When, How Much, How Often
436. Systematic review of skin toxicity from hair cosmetic ingredients including CAPB, 2022 (PMID 35805241)A
     Cited in: Temple Acne: Rinsing the Side of Your Face and Wiping Glasses Arms
437. Systematic review of the causes of adult female acne, 2025 (PMID 40309637)A
     Cited in: Jawline Acne Causes: A 2-Week Log for Period, Shave and Mask Days
438. Three moisturizing creams vs no treatment and SLS irritation response: RCT in 49 adults with atopic dermatitis, 2022 (PMID 35167133)A
     Cited in: Damaged Skin Barrier: What to Stop and Keep in the First 3 Days
439. Three-week randomized comparison of two cleansers in women with sensitive skin, 2013 (PMID 24305430)A
     Cited in: Cleansing Cream: When to Use It, by How Much Makeup You Wear
440. Tolerability of fragranced vs. fragrance-free facial cleansers in sensitive skin, 153 people, 2015 (PMID 26682289)A
     Cited in: Foam Cleanser Switch: A 2-Week Log for Tightness and Breakouts
441. Tolerability of tretinoin cream with an SPF 30 moisturizing lotion: split-face RCT, 2012 (PMID 23135655)A
     Cited in: Skincare Routine Order: Where to Slot a New Product, How Long to Wait
442. Tolerability of two sunscreens used alongside acne medication, 51 people, 2023 (PMID 38152154)A
     Cited in: Sunscreen Breakouts: Test a New One From Jawline to Half-Face
443. Topical linoleic acid and microcomedone size, placebo-controlled crossover trial, 1998 (PMID 9692305)A
     Cited in: How to Test New Skincare Products for Clogged Pores Over 4 Weeks
444. Topical linoleic acid and microcomedones, crossover RCT with digital image analysis, 1998 (PMID 9692305)A
     Cited in: Whiteheads and Blackheads: A Week-by-Week Plan Without Squeezing
445. Two-week low-glycemic diet and IGF-1: RCT in 66 adults with acne, 2018 (PMID 29691143)A
     Cited in: How to Get Better Skin by Charting Bedtime, Meals, Stress Weekly
446. Two-week trial of a lecithin and glycolic acid biphasic serum, 37 participants, 2026 (PMID 41987370)A
     Cited in: AHA BHA in Your First 2 Weeks: Day-by-Day Plan and Stop Signs
447. Updated Swiss recommendations for acne care, 2025 (PMID 40772752)A
     Cited in: Acne Medication Visit: A Record Sheet to Bring to Your Dermatologist
448. Use test and patch test in isoeugenol contact allergy, 19 participants, 1996 (PMID 8879928)B
     Cited in: Skincare Routine Order: Where to Slot a New Product, How Long to Wait
449. Using dermocosmetics in acne care: South African expert consensus, 2026 (PMID 41689191)A
     Cited in: Skincare Routine Order: Where to Slot a New Product, How Long to Wait
450. Visible light pigment changes and 7% vitamin C, randomized comparison, 58 participants, 2025 (PMID 41142247)A
     Cited in: How to Store Vitamin C Serum, Read Its Label, and Spot Oxidation
451. Washing hands 15 times a day with and without a moisturizer: double-blind RCT, 132 adults, 2010 (PMID 20199550)A
     Cited in: Damaged Skin Barrier: What to Stop and Keep in the First 3 Days
452. Water-filtered infrared-A irradiation and ingredient penetration, 12 men, 2008 (PMID 19675735)A
     Cited in: Pore Device Use Log: What to Record and When to Take a Break
453. Yellow-brown skin staining from ascorbic acid wet wipes, case report, 2021 (PMID 33577095)C
     Cited in: How to Store Vitamin C Serum, Read Its Label, and Spot Oxidation

For what each evidence grade means, see our editorial policy.