<unk>  is characterized by patches of<unk> , present at birth, which increase in size and number with age. This is a genetic disease, however the gene that accounts for this spotty darkening of the skin has yet to be discovered. Although rare, the congenital disease is most prevalent among populations originating from China.
Familial progressive hyperpigmentation
Epidermal nevus syndrome
Photodermatosis
Dermatopathia pigmentosa reticularis
Dyschromatosis universalis hereditaria
Keratosis
Halogenoderma
Vitiligo