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Acne affects nearly everyone — more than 90% of all adolescents, nearly 50% of all adult women and 25% of all adults. And since acne crosses gender lines as well as national borders, it's one of the most widespread medical conditions in the world. Yet there's still no cure.

But there is hope. While acne isn’t curable, it is treatable. We know more about controlling acne than ever before. The secret to managing acne is...