There are various causes for the darkening of the dorsum of the foot. Considering the personal hygiene of the patient, a prolonged failure to clean the foot can lead to a darkening of the dorsum of the foot. If the blackening does not improve after cleaning, then it is possible that the dorsum of the foot is exposed to ultraviolet radiation, especially in summer, when the symptoms of blackening of the dorsum of the foot are more obvious. Excluding the above two factors, the dorsum of the foot black also includes physiological factors as well as pathological factors: a. Physiological factors: If the patient’s dorsum of the foot in the appearance of normal skin elasticity, and no hyperplasia, depression and other symptoms, while no itching, pain and other abnormal feelings, it is judged to be congenital factors leading to the dorsum of the foot black, without treatment. Second, pathological factors: 1, pigmentation: local pigmentation, such as thromboembolic vasculitis, due to local ischemia, resulting in pigmentation, the symptoms of blackening of the back of the foot. Local hydroquinone cream, vitamin E cream can be used under the guidance of a doctor to apply to relieve the blackening of the dorsum of the foot. Patients with varicose veins can be treated with elastic stockings and elastic bandages to help the venous circulation due to local skin malnutrition, which causes pigmentation and blackening of the dorsum of the foot. At the same time, drugs such as diosmin and aspirin are applied, and severe cases can be treated by surgery. In addition, diabetes can trigger vascular as well as neuropathy, thus local skin pigmentation, resulting in blackening of the back of the foot, ulceration and other symptoms, choose insulin control; 2, capillary bleeding: patients due to poor elasticity of skin capillaries, resulting in capillary bleeding, the symptoms of blackening of the back of the foot, can be treated with oral vitamin C tablets, zinc gluconate, etc.