The redness and burning of the face when exposed to heat may be a normal physiological phenomenon, but it may also be caused by sensitive skin, cholinergic urticaria, rosacea and other reasons. 1. Physiological conditions: When the skin of the face is hot, due to the need for heat dissipation, the phenomenon of redness and scalding can occur, mostly normal physiological conditions, can be improved by getting out of the high temperature environment, massage the face, cold water wash the face and other ways. 2. Sensitive skin: The cuticle of the skin on the face of such patients is thin, and the skin is more sensitive than others. It is recommended to stay away from the hot environment, use water to wet compress or wash the face, and choose skin care products to repair the skin barrier, and generally the symptoms can be improved. 3. Cholinergic urticaria: you can take oral antihistamine drugs under the guidance of a doctor, such as loratadine, and at the same time, external glycerine lotion and other rub, has the effect of stopping the itching, eliminating redness and swelling, and anti-allergic. 4. Rosacea: antibiotic drugs such as erythromycin and metronidazole can be used as prescribed by the doctor. Life to reduce the intake of spicy stimulating food, try to choose medical skin care products, pay attention to strengthen the facial sunscreen. If the symptoms of redness and burning of the face in the heat continue to be unrelieved, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease, and to follow the doctor’s instructions for treatment.