Dandruff is a condition in which dead skin cells are shed from the scalp in large enough amounts to be noticeable. When these dead cells stick together, often because of surface debris and oil in the hair, they are noticeable as flakes in the scalp and on clothing.
Dandruff is a mild form of seborrheic dermatitis of unknown cause. It is more of a nuisance and a cosmetic problem than a medical one.
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