Acne No More - What causes acne?
 

All acne is a disorder of the sebaceous unit, which is made up of a hair follicle, sebaceous gland, and a hair.

These units are found everywhere on the body except on the palms, soles, top of the feet, and the lower lip. The number of sebaceous units is greatest on the face, upper neck, and chest. Sebaceous glands produce a substance called sebum, which is responsible for keeping the skin and hair moisturized. During adolescence sebaceous glands enlarge and produce more sebum under the influence of hormones, also called androgen. After about age 20, sebum production begins to decrease

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