Inner thigh black is mainly due to long-term friction, or the deposition of melanin particles after inflammatory treatment, clinically appearing pigmented dermatitis. Therefore, the treatment is as follows: 1, if it is simple inner thigh black, not accompanied by any other clinical uncomfortable symptoms, then you can take vitamin C tablets orally, in the topical medicine can be applied azelaic acid preparation and adapalene gel mixed topical. 2, if it is the inner thigh black, accompanied by itching, you can take orally Olopatadine Hydrochloride tablets, in the topical medicine can be applied to the levulinic acid vitamin C preparation and tacrolimus ointment alternating topical. 3, you can apply the left vitamin C preparation and tacrolimus ointment. Tacrolimus ointment alternately used externally. 3, you can choose to go to the regular three hospitals for medical treatment, such as if acid peeling, photorejuvenation laser, water light needle, as well as picoseconds, ultra-picoseconds treatment. During the treatment period, you need to abstain from spicy and stimulating food, abstain from alcohol, while wearing loose, pure cotton underwear.