Dermatitis, Seborrheic

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Dermatitis, Seborrheic

A chronic inflammatory disease of the skin of unknown etiology. It is characterized by moderate erythema, dry, moist, or greasy scaling, and yellow crusted patches on various areas, especially the scalp. On the scalp, it generally appears first as small patches of scales, progressing to involve the entire scalp with exfoliation of excessive amounts of dry scales (dandruff).