The distribution is also fairly stable and are nonprogressive hypopigmented patches.[2] The exact cause of nevus depigmentosus is still not clearly understood. A sporadic defect in the embryonic development has been suggested to be a causative factor.[3] It has been described as "localised albinism", though this is incorrect. Those with nevus depigmentosus may be prone to sunburn due to the lack of pigment, and the patient should use good sun protection.[4] Sunscreen should be applied to all exposed skin, since reduced tanning of normal skin will decrease the contrast with hypopigmented skin.[4] Most patients with nevus depigmentosus do not pursue treatment for their lesion.[5] There is no way to repigment the skin.[5] If, however, the lesion is of cosmetic concern, camouflage makeup is effective.[5] If the lesion is small one could also consider excision.[5]