Sun exposure, acne, trauma, and internal diseases can cause skin pigmentation, which can be removed with the help of treating the primary disease, using whitening medication, and medical cosmetic techniques. 1. Treatment of primary diseases: This is the key to effectively removing skin pigmentation. Patients suffering from sun exposure should pay attention to strengthening sun protection measures; patients suffering from acne can use topical retinoic acid, benzoyl peroxide, fusidic acid ointment, azelaic acid, etc. to help improve acne; patients suffering from trauma should pay attention to avoiding tearing and scabbing, preventing infection, etc.; patients suffering from internal diseases (e.g., adrenal gland disease, liver disease, etc.) should be treated with hormone therapy and liver-protecting therapy. 2. Use of whitening drugs: On the basis of the treatment of the primary disease, you can locally apply ointments that are conducive to the elimination of melanin precipitation, such as hydroquinone cream, vinblastine cream, cumulonimbin cream cream, vitamin E cream and other ointments, which can help inhibit the synthesis of melanin and accelerate the excretion of melanin, so as to effectively remove the pigmentation of the skin. 3. Medical cosmetic technology: For patients with more serious skin pigmentation and a greater impact on their appearance, a variety of medical aesthetics can also help remove melanin deposits, such as laser treatment, whitening injections, photorejuvenation, chemical peeling, etc., which can break down the skin pigmentation, accelerate the metabolism of melanin, and inhibit the formation of melanin, and other mechanisms to help remove the skin pigmentation of localized pigmentation. It is recommended that patients go to a regular hospital, under the guidance of a physician for treatment, do not blindly self-medication, in order to avoid adverse reactions.