The pathogenesis of acne vulgaris is multifactorial. The key factor is genetics.1 If both parents had acne, 3 of 4 children will have acne. If 1 parent had acne, then 1 of 4 of the children will have acne. However, similar to other genetic conditions, not every family will have the same pattern, with acne vulgaris sometimes skipping generations. What is inherited is the propensity for follicular epidermal hyperproliferation with subsequent plugging of the follicle. Additional aggravating factors include excess sebum, the presence and activity of Propionibacterium acnes, and inflammation.
