Skin black-and-white contrast

Black-and-white contrast of skin refers to the contrast of black-and-white areas on the skin surface. Usually, the color of skin is determined by the degree of melanin and pigmentation. The greater the contrast between black skin and white skin, the more obvious the difference between melanin and pigmentation. In medicine, the contrast between black and white skin can be used to judge the severity of some skin diseases, such as vitiligo.