Acne
Acne is a very common skin condition characterised by comedones (blackheads and whiteheads) and pus-filled spots (pustules).
It usually starts at puberty and varies in severity from a few spots on the face, back and chest, which most adolescents will have at some time, to a more serious problem that may be embarrassing, sap self-confidence and cause scarring.
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For the majority it tends to resolve by the late teens or early twenties but can persist for longer in some people.
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Acne can develop for the first time in people in their late twenties or even the thirties. It occasionally occurs in young children.