The methods of melanin lightening are all encompassing and are summarized into two main categories: invasive and non-invasive treatments. For invasive treatments, Q laser and picosecond laser are currently the first choice for treatment, which can also be done by using photons. Non-invasive treatment is generally divided into the following aspects: 1, avoid direct exposure to the sun, it is best to apply some whitening sunscreen on the exposed parts; 2, reasonable diet, usually drink more water, eat more fresh fruits and vegetables, such as white radish, kiwi rich in vitamin C can antioxidant, inhibit the synthesis of melanin, stop fat oxidation; cucumber rich in protein, vitamin B2, vitamin C, vitamin E, carotene, cucumber acid, which contains Cucumber is rich in protein, vitamin B2, vitamin C, vitamin E, carotene, cucumber acid, which contains cucumber acid that can promote human metabolism, help eliminate toxins in the body, keep the skin elastic to reduce the formation of melanin; 3, oral medication, there are vitamin C, tranexamic acid tablets, traditional Chinese medicine, etc.; 4, external decolorization or blemish removal agent, you can use 3% hydrogen peroxide, 5% white mercury ointment or choose whitening sunscreen and tranexamic acid for wet compress, import, etc.; 5, Prohibit the use of ointment or cosmetics containing estrogen, and keep a relaxed mood and enough sleep.