Nevus depigmentosus is a congenital disorder of pigmentation
which occurs in all sexes and races. It commonly presents in childhood and is mostly nonprogressive. It is a form of cutaneous
mosaicism with functionally defective melanocytes and abnormal melanosomes. Localized solitary lesions need to be differentiated from conditions like nevus anemicus, ash leaf macule, vitiligo
, etc. And generalized lesions from hypomelanosis of Ito
. Treatment is usually not required although cosmetic camouflage, phototherapy, grafting, and other modalities may be tried.