The black color of the root of the leg needs to carefully observe the skin morphology of the root of the leg area, if the black area has a raised, keratotic hyperplasia-like changes in the skin surface, considering keratotic eczema, and long-term friction stimulation and allergic factors have a direct relationship. 1, if you want to improve the symptoms, it is recommended that you choose to use fluticasone propionate cream with the compound lactic acid cream, which can quickly relieve the symptoms, if the black part of the edge of the raised, the middle of the itch, with the fungal infection caused by ringworm. If the edges of the blackened area are raised and the middle is concave, accompanied by itching at night, it is considered to be ringworm caused by fungal infection, it is recommended to take oral terbinafine tablets and use miconazole nitrate cream externally, and continuous treatment for about 10 days, which can have the desired effect.2. If the surface of the skin is purely dominated by hyperpigmentation without obvious self-consciousness, it is considered to be the friction-triggered hyperpigmentation, and it is suggested that hydroquinone cream is applied to whiten the skin.