Hand white face black, consider and heredity, body quality, sunshine, other physical and chemical stimuli and other factors related. 1. Heredity: human skin color is subject to genetic factors are very large, if the parents are also white face and body black, then the child has a greater likelihood of this situation. 2. Physical: Physical factors are also important in determining skin color, melanin in different parts of the distribution density is different, and varies from person to person. 3. Sunshine: the face is the longest part of the body exposed to sunlight, do not pay attention to sunscreen, the sun’s ultraviolet rays will lead to black skin, natural hand white face black. 4. Other physical and chemical stimuli: the face of perennial wind blowing daily, and a variety of skin problems are concentrated in the face of the high incidence, such as eczema may leave pigmentation, etc., there will also be the phenomenon of hand white face black. Hand white face black there may be other factors, if there is no other discomfort, you can observe, if especially obvious, you can consult a dermatologist.