The more you scratch in summer, the more itchy your calves may be due to neurodermatitis, insect bite reaction, hives and other diseases. 1. Neurodermatitis: the etiology of neurodermatitis is not yet clear, it may be caused by mental tension, overwork, chronic friction, improper diet and other factors. Patients will appear local skin itching intense, often in the local stimulation, nerve irritation, itching symptoms aggravated, manifested in the summer calf the more scratching the more itchy. 2. Insect bite reaction: insect bite reaction is a kind of allergic dermatosis that occurs after insect bites the skin. Patients will appear localized itching, pimples, erythema and other symptoms, some patients manifested in the summer calves more itchy. 3. Urticaria: Urticaria may be caused by food allergies, drug allergies, infections, mental stress and other factors. Patients will appear itchy skin, and manifested in the summer calves the more itchy scratching. Once the patient appeared in the summer calf itchy situation, should go to the hospital, to find out the cause of the disease.