Patients with itchy thighs and calves, the possible causes are as follows: 1, may be the emergence of allergic reactions, such as the emergence of allergic dermatitis, inflammation, may be caused by the patient’s contact with allergens, may also be eating allergic food, and eventually the formation of leg itching and produce a certain inflammatory reaction; 2, may also be patients with poor blood circulation in both lower extremities, such as the emergence of saphenous varicose veins and other phenomena caused by bruising dermatitis, once occurred, will also cause itching thighs and calves, accompanied by a certain inflammatory, hemorrhagic erythema, will also produce color changes, appearing deepening color or gradually darkening and other phenomena.