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. Prevalence of acne in a community sample of 14–16 year olds has been recorded as 50% and it has been estimated that up to 30% of teenagers have acne of sufficient severity to require medical treatment. Overall incidence of acne is similar in both men and women, and peaks at 17 years of age.
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.
There are some recent researches in this field like: Body mass index is negatively associated with acne lesion counts in Taiwanese women with post-adolescent acne. I can’t get access to the full text of this study, but it appears that researchers found evidence that heavier people have less acne than thin people.