Factors that determine human skin color include heredity, environment and disease. 1. Heredity: Heredity is the main factor that determines skin color, at present, according to the different skin color can be divided into yellow, white, black, the genes of different races determine the skin color of different groups. 2. Environment: Ultraviolet radiation can affect skin color, long-term sun exposure can lead to skin color deepening, but this skin color change can usually be done through good sunscreen and other measures and gradually recover. 3. Disease: Liver disease patients may have dull skin, skin melanosis patients may have darkened skin color, chloasma patients may have deepened facial skin color. If there is any unexplained change in skin color, patients should consult a doctor for a clear diagnosis.