How is epidemiology of acne vulgaris?

• OCCURRENCE: very common, affecting approximately 85% of young people • AGE OF ONSET: Puberty; may appear for the 1st time around 25 years or older • SEX: More severe in males than in females • RACE: Lower incidence in Asians and Africans • GENETIC ASPECTS: Multifactorial genetic background and familial predisposition. Most individuals with cystic acne have a parent(s) with history of severe acne. Severe acne may be associated with XYY syndrome (rare)