Once the summer calves itch consider summer dermatitis, but can not be ruled out that the patient is allergic to the unique items of summer contact dermatitis, need to be specifically analyzed. 1. Summer dermatitis: mainly due to the higher temperature in summer, the skin sweats more, the metabolic substances in the sweat and dust accumulates on the surface of the skin, resulting in skin irritation, the main symptom is itchy, usually accompanied by erythema or pimples and other lesions. 2. Contact dermatitis: Itchy calves in summer, may be the patient’s allergy to summer-specific items, such as plants, represented by poplar floss, so the patient will have an allergic reaction every summer, the symptoms of itchy calves. It is recommended that patients seek timely medical treatment to determine the cause of the disease under the guidance of the doctor, and carry out targeted treatment after fully integrating the individual situation.