Stinging and itching after being exposed to heat may be caused by cholinergic urticaria, atopic dermatitis, eczema and other diseases. 1. Cholinergic urticaria: mainly related to the skin localized temperature rise, hot bath, hot weather and other factors can also trigger the disease. The patient will appear localized round papules of wind, accompanied by itching, tingling sensation and other symptoms. 2. Atopic dermatitis: the cause of the disease is not yet clear, may be related to genetic, immune abnormalities, skin barrier damage and other factors, seasonal, temperature changes and other reasons may also trigger the disease. Patients will have dry skin, intense itching, pimples and other symptoms, and may feel tingling on the body after being exposed to heat. 3. Eczema: Eczema is an inflammation of the superficial dermis and epidermis caused by a variety of internal and external factors. It can be manifested as erythema, papules with scales, and the itching symptoms are aggravated by heat. The causes of itchy body after heat are more, it is recommended that patients go to the regular hospital to find out the cause of the disease, and follow the doctor’s instructions for treatment.