hypomelanosis ( leukoderma ) may be divided histopathologically into melanocytopenic disorders on which melanocytes are absent ( eg , vogt-koyanagi-harada syndrome and vitiligo ) , melanopenic disorders in which melanocytes are present but melanin is reduced ( eg , nevus depigmentosus and incontinentia pigmenti achromians ) , and nonmelanotic disorders in which melanin pigmentation is unaffected ( nevus anemicus ) and the pigmentary abnormality is caused by something other than melanin .
C0162835
leukoderma
C0042900
vitiligo