poliosis

poliosis /pō′lē·ō″sis/ [Gk, polios + osis, condition] , depigmentation of the hair on the scalp, eyebrows, eyelashes, mustache, beard, or body. The condition may be inherited and generalized or acquired and localized in patches. Acquired localized poliosis often occurs in alopecia areata.

Poliosis (Hordinsky, Sawaya, and Scher, 2000)