The causes of itchy skin on the lower legs in winter include eczema, winter itching and ichthyosis. 1. Eczema: Eczema is an inflammation of the skin triggered by a variety of factors, at this time the skin defense is weakened, and the skin will be itchy in winter. 2. Winter pruritus: due to the dry climate in winter, the water content of the skin stratum corneum is low, the sebaceous glands of the skin secretion is reduced, affecting the skin barrier function and make the nerves more sensitive. At the same time part of the population bath water is too hot and other reasons lead to dry skin, dry and hot and cold changes in the stimulation of the skin easily triggered by itching. 3. Ichthyosis: this disease is a hereditary skin disease, mostly manifested as dry and flaky skin. The disease is generally no conscious symptoms, but low temperatures, dry air will be aggravated and itching. Appear every winter calf skin itchy symptoms, it is recommended to timely regular hospital dermatology consultation.