Skin erythema is a common skin stress reaction that can be caused by thermal irritation, allergic reactions, etc. It is recommended to first apply a cold compress with a damp towel, which can relieve the swelling, and for those caused by allergies, add antihistamines, such as imipramine, as appropriate. Skin redness and swelling is not a disease, there may be a variety of causes, the most common I degree burns, only skin erythema, swelling, with severe pain. At this time, cold compresses or cold water continuous rinsing can be done, it is not recommended to apply ice directly to avoid tissue damage caused by excessive temperature difference. For those caused by allergy, often accompanied by itching, recall the medical history and try to find allergens, common ones such as food, drugs, local contacts, skin care products, ultraviolet light, etc.. For treatment, oral cetirizine tablets or imipramine tablets are recommended, and compound glycopyrrolate capsules are added when the effect is not good.