Itchy skin on legs may be related to physiological factors such as dry climate, or pathological factors such as atopic dermatitis and ringworm. 1. Physiological factors: daily due to the seasonal causes of dry climate, resulting in dry human skin, may lead to the appearance of itchy skin on the legs. 2. Pathologic factors: (1) allergic dermatitis: mainly caused by contact with animal, plant and chemical allergens, often showing rashes, itching, tingling, redness and swelling, etc., which may lead to the emergence of itchy skin on legs. (2) ringworm: mainly due to fungal infections, obesity, humidity, etc. can also trigger the disease, often showing red papules, blisters, itching, etc., may lead to itchy legs. The causes of itchy skin on legs are more, should choose to seek medical treatment early, identify the cause of the disease, standardized treatment.