Coffee does not generally increase melanin on the face. The so-called “dark foods” such as coffee, soy sauce and chocolate are metabolized in the body, and the metabolic components are basically amino acids, water, inorganic salts, etc. There are usually no pigment particles deposited on the surface of the skin. Melanin is produced and stored in melanocytes and is widely found in the skin, mucous membranes, and retina. The level of melanin in the body, as well as their increase and deposition, is generally influenced by genetics, hormone levels, UV stimulation, etc., while substances such as coffee, which are absorbed through the digestive tract and have become nutritional meal components, do not act directly on the face to cause an increase in melanin. If a large amount of coffee consumption affects sleep, the body may lead to an increase in facial melanin due to hormonal secretion, but this effect is also very small. The main dietary treatment to get rid of melanin on the face can be to eat more vegetables and fruits rich in vitamin C and vitamin E. Drugs can be topical tyrosinase inhibitor ointment, applied on the melanin site, can improve the pigmentation, and can also choose laser treatment. You need to pay attention to sun protection and reduce ultraviolet radiation to prevent stimulating the skin to produce more melanin.