Itching of the legs and buttocks all the time may be due to physiological causes such as dry skin or excessive temperature differences in the external environment. It can also be caused by pathological factors such as various skin conditions such as ringworm, eczema and urticaria, which need to be identified on the basis of the skin lesions. If the itching is severe, it can be treated with anti-itch medication. Moisturise your skin well to avoid excessive dryness.