Acne is a common skin condition that affects the hair follicles and the sebaceous glands in the skin, which secrete an oily substance called sebum. Acne commonly on occurs on the face, arms, back and chest.
Most adolescents and young adults show evidence of acne. It is most prevalent between 15 and 24 years, and is more common and more severe in males than in females. Onset peaks early in puberty and usually resolves in males during their early 20s. Females can develop acne for the first time after puberty and are more likely to suffer ongoing acne, which can persist into their 30s and 40s. Acne mainly affects the face, neck, chest, shoulders and upper back; areas which have the highest density of sebaceous glands.
The exact cause of acne is unknown, but doctors believe it results from several related factors. One important factor is an increase in hormones called androgens (male sex hormones). These increase in both boys and girls during puberty and cause the sebaceous glands to enlarge and make more sebum. Hormonal changes related to pregnancy or starting or stopping birth control pills can also cause acne.
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