Pigmentary disorders in China.

Because variations in the degrees of pigmentation occur in various regions of the body, there are different pigmentary diseases in various ethnic groups. We usually divide the disorders of melanin pigmentation into two types: hypermelanosis and hypomelanosis. These disorders may be due to genetic and environmental factors. Pigmentary disorders are more visible on the Chinese skin and are of great cosmetic concern to patients. In this article we introduce characteristic pigmentary disorders in China.