Itchy skin may be caused by physiological factors such as dry skin, or it may be caused by diseases such as hives and ringworm. 1. Physiological factors: If the climate is cold and the surrounding environment is dry, it may lead to dry skin and thus itchy skin. 2. Urticaria: the cause of the disease is mostly related to food and drug allergies, infections, the environment, physical factors, etc., mainly manifested as a peripheral eruption of red masses, accompanied by intense itching and other symptoms. 3. Ringworm: the cause is mainly caused by ringworm infection, sweating, wearing tight and airless clothes, low immunity and other factors are easy to trigger ringworm. The main manifestations are pimples, papules, erythema and so on, and accompanied by itchy skin. There are many reasons for itchy skin, after excluding physical factors, patients can go to the hospital to clarify the cause.