Coffee does not increase melanin on the face. When so-called “dark-colored foods” such as coffee, soy sauce, and chocolate are metabolized in the body, the metabolized components are basically amino acids, water, inorganic salts, etc., and there are usually no pigment particles deposited on the surface of the skin. Melanin is produced and stored in melanocytes, which are widely found in the skin, mucous membranes and retina. The level of melanin in the body, as well as their increase and deposition, are generally affected by heredity, hormone levels, ultraviolet stimulation, etc. Substances such as coffee, which has become a nutritious meal component when absorbed through the digestive tract, will not directly act on the face to cause an increase in melanin. If a large amount of coffee consumption affects sleep, the human body may be due to hormone secretion problems leading to an increase in facial melanin, but this effect is also very small. The main dietary treatment to get rid of melanin on the face can be to consume more vegetables and fruits rich in vitamin C and vitamin E. Drugs can be used externally tyrosinase inhibitor ointment, in the melanin area for application, can improve the pigmentation, but also can choose laser treatment. Usually need to pay attention to sunscreen, reduce ultraviolet radiation, to prevent stimulation of the skin to produce more melanin.