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Skin disorder of the scalp, a mild form of dermatitis. It affects most people at some time, when the scalp, which normally sheds its dead outer skin cells continuously, starts to shed them intermittently, causing a scaly buildup before shedding and noticeable flakes of skin when shedding occurs. Dandruff is not contagious and often goes away spontaneously; special shampoos can control it.
This entry comes from Encyclopædia Britannica Concise. For the full entry on dandruff, visit Britannica.com.