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Poliosis

From Biology-Online Dictionary | Biology-Online Dictionary
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poliosis

A patchy absence or lessening of melanin in hair of the scalp, brows, or lashes, due to lack of pigment in the epidermis; it occurs in several hereditary syndromes but may be caused by inflammation, irradiation, or infection such as herpes zoster.

Synonym: trichopoliosis.

Origin: G., fr. Polios, gray