Melanin deposits in the thigh triangle may be caused by excessive friction, acanthosis nigricans, post-inflammatory hyperpigmentation, etc. The methods of removing them include life conditioning, topical medications, and laser treatment. 1. Excessive friction: patients need to wear loose, soft pants and underwear, avoid too tight, minimize the friction on the skin. 2. Acanthosis nigricans: actively search for and remove the causes of tumors and endocrine diseases; obese patients with acanthosis nigricans need to control their weight; drug-induced patients need to discontinue the suspected drugs, and the lesions can be relieved. In addition, salicylic acid ointment, urea ointment, vitamin A cream and other drugs can be used to apply, and if necessary, it can be improved by laser treatment. 3. Post-inflammatory hyperpigmentation: Hyperpigmentation will remain after inflammation of the skin, such as fixed drug rash, eczema, etc., which can subside after a period of time without treatment. If you do not see recovery for a long time, you can also use the laser to remove the method. There may be other causes of melanin precipitation in the thigh triangle, and it is recommended that patients consult a doctor in time to clarify the cause of the disease. Medications should be used under the guidance of a doctor.