The black inner thighs of women are generally a normal physiological phenomenon, and local friction, sex hormone levels and other reasons, generally do not need to deliberately eliminate. If you really feel that it affects the beauty, you can carry out life conditioning, medication and laser removal. However, the black inner thighs of girls may also be caused by acanthosis nigricans as well as eczema and ringworm, which need to be treated, and some of them can be eliminated, while some are difficult to eliminate. You can change your lifestyle habits, wear loose clothing, lose weight, apply hydroquinone cream, arbutin cream, etc. You can also take vitamin E and cumene orally to improve melanin deposition, or you can use laser to promote melanin decomposition in professional medical institutions. This physiological factors lead to the inner thigh black, generally do not need to deliberately eliminate, if you want to eliminate, can be improved through the above methods, generally eliminate the effect is better. Second, pathological factors 1, acanthosis nigricans: patients will appear black inner thighs or armpit black performance, and dry skin surface, rough. There are many types of acanthosis nigricans, if it is benign acanthosis nigricans, drug acanthosis nigricans, it may slowly improve after puberty or after stopping the drug, you can also use external keratolytic agents such as carboxytriol, vincristine ointment for improvement, some patients may eliminate the skin blackening. If it is malignant acanthosis nigricans, obesity acanthosis nigricans, etc., it is difficult to eliminate the black skin, especially malignant acanthosis nigricans, severe lesions, deep pigmentation, may be accompanied by itching, need to perform surgery, may also need radiotherapy; 2, eczema and ringworm: these two conditions lead to the inner thigh black, generally after the healing of inflammation pigmentation, mainly for the treatment of pigmentation, you can apply hydroquinone cream, arbutin Arbutin cream, etc. If eczema and ringworm are not completely healed, they can be treated with mupirocin ointment and fusidic acid cream.