Acne is, affecting over 80% of teenagers (aged 13–18 years) at some point. Estimates of prevalence vary depending on study populations and the method of assessment used. Overall incidence of acne is similar in both men and women, and peaks at 17 years of age. The number of adults with acne, including people over 25 years, is increasing; the reasons for which are unclear.
There are many topical acne treatments. Some topicals help kill the bacteria. Others work on reducing the oil. The topical medicine may contain a retinoid, prescription-strength benzoyl peroxide, antibiotic, or even salicylic acid.