Acne is often dismissed as a teenage skin problem that will eventually disappear on its own. But for many people, acne continues well beyond adolescence—or begins for the first time in adulthood. A few occasional pimples may be manageable, but persistent blackheads, whiteheads, inflamed pimples, painful nodules or cystic acne can affect much more than appearance. Untreated or inadequately treated inflammatory acne can leave persistent pigmentation and permanent scars. The good news is that acne is treatable. Modern acne treatment is not simply about drying out pimples or repeatedly cleaning oily skin. Acne is a complex inflammatory disorder involving the