Acne is a disarray of pilosebaceous unit, which is a combination of sebaceous glands and hair.They are almost found on the entire body but mostly the face and neck. The gland expands and generates more sebum during adolescence. This generation of more sebum is due to the influence of hormones(androgens).The sebum generation decreases after the age of 20.
Teenagers- the victims of acne. Sometimes even adults develop acne. Acne though embarrassing is a sign of teenagers maturity. This age when teenagers are exposed to the environment, plugging of the sebum as well as bacteria , and the dead cells shed from the duct lining leading to acne.