Itchy calves in summer, may be caused by papular urticaria, eczema, ichthyosis or pruritus, etc., need to go to the hospital in time to clarify the cause of the disease, and under the guidance of the doctor to use medication. 1. Pemphigus urticaria: also known as insect bite dermatitis, is an allergic reaction to the skin caused by insect bites, most commonly seen at night in the spring and summer seasons. The main manifestation is scattered pimples on the lower limbs, with small blisters on its surface and obvious itching. 2. Eczema: the etiology is unknown, it is an inflammatory skin disease caused by internal and external factors, which may be related to heredity, immunity, infection, and contact with sensitizers. Symmetrical erythema, papules, and flaking with itching may appear on the calf area. 3. Ichthyosis: it is a hereditary disease, with family aggregation of episodes of phenomenon, the body lacks vitamin A easily lead to aggravation of the disease. The performance of both lower limbs symmetrically appear fish scale brown scales, scales in the middle of the fixed, the edge of the mild warping, accompanied by different degrees of itching. 4. Pruritus: a common cause of dry skin, especially bathing too often, older patients are prone to appear. Mainly manifested as bilateral skin without obvious skin lesions, but there is obvious itching, skin flaking increased. It is recommended that patients with itchy calves in the summer go to the regular hospital in time, after a clear diagnosis under the guidance of the doctor standardized treatment.