Whenever the heat is red, it may be a normal phenomenon, or it may be caused by skin sensitivity, atopic dermatitis, cholinergic urticaria and other factors. It is recommended to pay attention to sunscreen, if necessary, go to the hospital, and give antihistamine drugs to regulate. 1. Normal phenomenon: the surrounding environment temperature is too high, the blood circulation is accelerated, resulting in facial redness; emotional excitement, a large number of sports lead to an increase in the body’s heat production, will also cause facial redness. It is recommended to detach from the environment, adjust the mood, the symptoms can be gradually recovered, generally do not need special treatment. 2. Skin sensitivity: The skin cuticle is thin, the skin texture is sensitive, by the hot and cold stimulation, may lead to skin redness. It is recommended to do a good job of skin care, go out and pay strict attention to anti-freezing, sunscreen, can help improve. 3. Allergic dermatitis: the use of irritating skin care products, resulting in damage to the skin barrier, the stimulation of heat, resulting in inflammation of the skin, is also the main reason for the redness of the face. It is recommended to go to the dermatology department of the hospital, and if necessary, give chlorpheniramine maleate, loratadine and other antihistamine medication. 4. Cholinergic urticaria: Patients with cholinergic urticaria can release acetylcholine if their body temperature rises due to heat stimulation, resulting in redness of the face. It is recommended to make a clear diagnosis and give drugs such as loratadine, cetirizine, ketotifen, and ipratropium, which have the effect of anti-allergy and relieving itching. It is recommended to avoid the stimulation of heat, if necessary, go to the hospital dermatology department for examination, targeted to give the appropriate drug treatment, do not self-medication.