Black itchy legs may be bruised dermatitis, contact dermatitis, nodular itchy rash and other diseases, need to be analyzed according to the symptoms. 1. Siltation dermatitis: more involved in varicose veins of the lower limbs, manifested by rapid swelling of the lower limbs, flushing, fever, superficial varicose veins and eczema-like lesions, dark brown pigmentation and rash (ferritin deposition) in front of the tibia and near the ankles, secondary eczema-like changes can occur in acute or chronic lesions, resulting in black itchy legs. 2. Contact dermatitis: contact dermatitis is mainly due to skin contact with exogenous stimuli, irritation of the skin or triggered by an allergic reaction. The patient’s main symptoms are erythema, mild edema, papules, vesicles, ulcers, etc., there will be itching, swelling and pain and other symptoms, if the ulcer surface is crusted, it will lead to the patient has the performance of the legs black and itchy. 3. Nodular itchy rash: warty nodular damage, occurring in the limbs, especially in the calf extensor surface is common. The lesions began as edematous red firm papules, soon to be soybean or larger hemispherical nodules, the top of the keratinization is obvious, can be wart-like hyperplasia, dark brown, often scattered in the distribution. Itching is intense. It can also lead to the phenomenon of patients with dark and itchy legs. There may be other reasons for the black itching on the legs, and you should seek medical treatment in time and follow the doctor’s instructions.