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Nevus depigmentosus
Nevus depigmentosus or nevus achromicus is a depigmentation problem in skin which can be easily differentiated from vitiligo. Although age factor has not much involvement in the nevus depigmentosus but in about 19% of the cases these are noted at birth. Their size may however grow in proportion to growth of the body. The distribution is also fairly stable and are nonprogressive hypopigmented patches. 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.
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. Sunscreen should be applied to all exposed skin, since reduced tanning of normal skin will decrease the contrast with hypopigmented skin.〔 Most patients with nevus depigmentosus do not pursue treatment for their lesion. There is no way to repigment the skin.〔 If, however, the lesion is of cosmetic concern, camouflage makeup is effective.〔 If the lesion is small one could also consider excision.〔
==Causes==
These white spots result from abnormalities in the function of melanocytes which produce little pigment thereby resulting in characteristic white spots in skin.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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