Acne. Computer artwork of a section through the skin showing a pimple forming in a hair follicle (centre) in the skin. The follicle has become blocked with sebum, an oily substance produced by the sebaceous gland (yellow). This allows bacteria present to multiply, causing inflammation and a pimple. The most common form of acne is acne vulgaris, which mainly affects adolescents. Treatment is with antibiotics.

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