Previous studies have proven that the main factor that determines the shade of skin color is the melanin content of the skin. Melanin is widely found in human skin, mucous membranes, retina, soft brain membrane, gallbladder and ovaries. Skin melanin metabolism is mainly in the skin is decomposed, dissolved and absorbed after penetrating the basement membrane, by the melanophilic cells phagocytosis and then eliminated from the body through the blood circulation, or through the melanocyte dendrites, transfer to keratin-forming cells, with the aging keratinocytes shed and expelled from the body. Want to metabolize the melanin out of the face, can be improved by the following ways: 1, lifestyle regulation: because the process of sleep usually carry out melanin metabolism, such as some people with high mental stress, often sleep deprivation, may affect the skin condition and regeneration, resulting in the slowdown of melanin metabolism. Proper sun protection, sunscreen or sunscreen treatment when going out, can also reduce melanin production; 2, diet regulation: melanin is synthesized by tyrosinase oxidation in the cells, so tyrosinase is the key enzyme of skin black biosynthesis. Can try to avoid foods containing more tyrosine in the diet, such as sesame, pumpkin seeds, almonds, etc., should also avoid fried food, spicy stimulation, artificial additives more food, etc.. Drink more water, eat vitamin C-rich fruits and vegetables, which can accelerate the metabolism of the skin and promote melanin metabolism; 3, drug regulation: the body can be regulated by Chinese medicine to promote melanin metabolism, such as chasteberry, dry lotus grass, northern sage, cuscuta, Chuan dome, safflower, tannin, perilla, etc., can have an activating effect on melanin metabolism. However, due to individual differences, medication reactions may occur between drugs and should be selected for use under the guidance of a doctor.