Source : Webster's Revised Unabridged Dictionary (1913)

Vitiligo \Vit`i*li"go\, n. [L., a kind of tetter, fr. vitium
   blemish, vice.] (Med.)
   A rare skin disease consisting in the development of smooth,
   milk-white spots upon various parts of the body.

Source : WordNet®

vitiligo
     n : an acquired skin disease characterized by patches of
         unpigmented skin (often surrounded by a heavily pigmented
         border)