Itchy calves in summer may be caused by summer dermatitis, sunburn and other reasons. 1. Summer dermatitis: summer dermatitis is a seasonal inflammatory skin disease caused by the heat of the climate, the trunk, limbs, especially the calf area lesions are obvious, manifested as a large bright red spots, in the erythema on the basis of a pinpoint to corn size pimples, pimples, accompanied by obvious itching. 2. Sunburn: sunburn is also known as solar dermatitis, strong summer sunlight or lower leg skin exposure for a long time, resulting in excessive ultraviolet radiation on the skin, will cause sunburn, which is manifested in the exposed parts of the diffuse erythema, edema, often accompanied by itching. Itchy calves in the summer is recommended to go to the hospital in time, to clarify the cause of the disease, under the guidance of the doctor to carry out active treatment.