First, there is an increase in sebum production and a blockage of the hair follicle. With the follicle blocked, the population of normal bacteria in the follicle increases dramatically. Acne is common in adolescents and young adults. It usually occurs in early adolescence and decreases after the age of 25. However, some people, particularly women, develop acne for the first time in their late twenties or thirties.
Severe acne seems to run in families and is seen more often in males.
Acne may also develop in individuals who also suffer from any of several endocrine disorders. In particular, acne may develop in individuals who have abnormalities in circulating androgens . Some drugs can also cause or make acne worse. Do not pop zits or pick at the acne. Popping zits and picking at the acne will not make the pustules heal faster.