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Acne cosmetica revisited: a case-control study shows a dose-dependent inverse association between overall cosmetic
Sanjay Singh1, Baldeep Kaur Mann, Narendra K Tiwary
1Department of Dermatology and Venereology, Varanasi, India.
Background:
Case-control studies to support the concept of acne cosmetica are lacking.
Objective:
To examine the association of post-adolescent acne with the use of cosmetics and cosmetic procedures.
Methods:
910 post-adolescent patients with acne and an equal number of matched controls were studied for exposure to cosmetics and cosmetic procedures. A cumulative cosmetic exposure index was stratified into four quarters of increasing exposure.
Results:
Comparison of different cumulative exposure categories with the lowest exposure category (multivariate analysis, logistic regression) showed that the odds ratios, which were always <1, progressively declined as cosmetic exposure increased [odds ratios (95% confidence intervals): 0.679 (0.501-0.922), 0.355 (0.258-0.487), 0.307 (0.217-0.433)]. However, some individual cosmetics had odds ratios >1.
Conclusion:
Overall cosmetic use was negatively associated with post-adolescent acne. The term 'acne cosmetica' is appropriate in the sense that some cosmetics may cause acne.
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