Acne is one of the most common skin diseases, affecting men and women equally often. Almost every teenager suffers from acne to a greater or lesser extent during the phase of hormonal changes during puberty.

Blackheads, pimples and acne commonly appear during puberty. They are associated with an oily complexion and enlarged pores in the T-zone. However, acne is not just a problem in teenagers. Many adults over 40, who sometimes barely had pimples as teenagers, suffer from a form of acne called late acne (Latin: acne tarda) or adult acne.