Been white all their life? Ahh....there are no guarantees my friend.
(might be NSFW)
http://images.search.yahoo.com/search/images?_adv_prop=image&fr=yfp-t-900&va=vitiligo
(might be NSFW)
http://images.search.yahoo.com/search/images?_adv_prop=image&fr=yfp-t-900&va=vitiligo