Acne

Encyclopedia of Science, The, October, 2005

Acne, also called acne vulgaris , is a chronic inflammation of the sebaceous glands embedded in the skin. These glands secrete sebum, an oily lubricant.

Although it may occur at any age, acne is most frequently associated with the maturation of young adult males. Part of the normal maturation process involves the production of—or altered expression of—hormones. During adolescence, hormones termed androgens are produced. Androgens stimulate the enlargement of the sebaceous glands and result in the increased production of dermal oils designed to facilitate the growth of facial hair. In females, androgen production is greater around the time of menstruation. Estrogen in females also reduces sebum production. As a result, acne often appears in young women at the time of their monthly menstrual period.

In most cases, acne resolves itself by the time the individual is 20-30 years old.

Contrary to popular myth, acne is not ...