Acne vulgaris is the most common disease involving the pilosebaceous unit. It is rarely misdiagnosed. It occurs at the site where there are sebaceous follicles and thus occurs predominantly on the face, back and chest. It occurs in all races and affects both sexes. The onset of acne is usually in early adolescence and affects up to 80% of all individuals. The milder physiological acne which affects many adolescents will last for 4 or 5 years, but the more clinical varieties will last for 12, and sometimes even 40 or 50 years.
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