The reason for black thigh roots: 1, black thigh roots, itchy, local skin rough, scratching after the powdered scales off, considered to be a long time ringworm is not cured caused by the use of clotrimazole ointment or terbinafine hydrochloride ointment rub the affected area, oral itraconazole capsules, bitter ginseng tablets, and other ringworm cured local skin will gradually return to normal. 2, usually often wear tight pants, thigh roots for a long time by the The skin at the root of the thighs will gradually turn white and return to normal skin color after a period of time, as long as you change your style of dressing and choose loose clothes to reduce the friction on the skin. 3. Obese people have a lot of folds at the root of the legs and armpits due to more fat, and the sweat in these areas cannot evaporate in time after sweating, and there is also fat between them when walking. Friction makes local melanin precipitation, resulting in the root of the thigh skin black symptoms, which is a normal physiological phenomenon. Want to make it back to normal skin color, it is recommended to reduce the weight to the normal range, so that the local skin to keep dry, after a period of time the skin will return to normal skin color.