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What is acne? Acne is a common skin condition that causes spots on the face, neck, back or chest. These spots can be whiteheads, blackheads or inflamed, pus-filled pimples. Adult acne, also called hormonal acne, is acne that continues past the age of around 18 to 20 or starts when someone is in their early twenties. Acne vulgaris generally affects teenagers and continues for 3 to 5 years although it can sometimes carry on for longer. Some people have a mild form of acne, with only occasional spots or outbreaks, while others have more severe acne, with large areas of the