Human skin color is determined by melanin, carotene, oxyhemoglobin, etc., and is influenced by both genetics and the environment. Dark skin can generally be whitened by medical cosmetic means, with more obvious results. The same time with dietary regulation, daily sun protection, skin care, for skin tone whitening has a certain effect. Sometimes dark skin is caused by disease, in which case priority should be given to treating the disease so that the dark skin can gradually become lighter. For environmental factors caused by skin darkening, such as prolonged sun exposure skin will be protective darkening, is a normal physiological phenomenon, want to become white can try whitening injections, the main components of vitamin C, glutathione, tranexamic acid and other reducing agents, through the inhibition of melanin synthesis to make skin tone white, but the effect varies from person to person. At the same time, in order to speed up melanin metabolism, you can consume vitamin-rich foods, such as foods rich in vitamin C and vitamin E, such as fresh vegetables and fruits and various kinds of coarse grains, which also have a certain effect on skin tone whitening. In addition, you need to pay attention to skin care, make sure to do a good job of sun protection measures, pay attention to moisturizing, and apply an adequate amount of sunscreen before going out. If the dark skin is caused by disease, such as suffering from end-stage renal disease, or certain endocrine diseases, such as Addison’s disease can cause the skin to darken, in this case the original disease needs to be treated to improve the skin tone, and patients are advised to seek medical attention for systematic treatment.