Acne

Acne (acne vulgaris, common acne) is a disease of the hair follicles of the face, chest, and back that affects almost all males and females during puberty; the only exception being teenage members of a few primitive isolated tribes living in Neolithic societies. It is not caused by bacteria, although bacteria play a role in its development. It is not unusual for some women to develop acne in their mid- to late-20s.

Acne can be distressing and annoyingly persistent. Acne lesions heal slowly, and when one begins to resolve, others seem to crop up.

Acne appears on the skin as:

• congested pores ("comedones"), also known as blackheads or whiteheads, 
• tender red bumps also known as pimples or zits, 
• pustules, and occasionally as 
• cysts (deep pimples, boils).

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