Summer skin erythema may be caused by contact dermatitis, eczema, urticaria and other diseases, or folliculitis and other diseases. 1. Contact dermatitis: contact dermatitis is an allergic reaction caused by the patient’s skin coming into contact with external substances, and the patient will have erythema, mild edema, pimples, itching, and so on, and there will also be ulcers, vesicles, burning pain, swelling and other symptoms. 2. Eczema: the cause of eczema is not clear, most of them are caused by organic diseases and allergies to external substances. The main symptoms of patients are erythema, papules, edema, etc., and there will also be rough skin thickening, itching, scaling and other symptoms. 3. Urticaria: urticaria causes more, can be triggered by a variety of factors, the patient’s main symptoms for the red red wind, angioedema, itching, etc., there will be fever, nausea, vomiting and other symptoms. 4. Other: folliculitis, acne and other diseases can also lead to the phenomenon of summer skin erythema. Patients with symptoms of summer skin erythema should consult a doctor in time and follow the doctor’s instructions for treatment.