Erythema may be caused by capillary dilatation, psoriasis, contact dermatitis and other factors, and can be relieved by physical therapy and medication. 1. Capillary dilatation: capillary dilatation belongs to the persistent expansion of dermal blood vessels, which is manifested as localized plaques, dots, filaments, and reticular erythema. It is necessary to avoid sun exposure, can cooperate with the doctor to choose the way of intense pulsed light dye laser treatment. 2. Psoriasis: this is a chronic scaly skin disease caused by a variety of factors, there will be erythema on the skin, which is covered with silvery-white scales, can be used with the doctor’s choice of topical hydrocortisone, dexamethasone and other glucocorticoid drugs. 3. Contact dermatitis: mainly caused by skin contact with external allergens, so there will be localized erythema accompanied by itching symptoms, can be applied with halometasone cream, oral loratadine, cetirizine and other antihistamine treatment. The causes of erythema are many, and different causes are treated in different ways, so it is recommended to consult a doctor for a clear diagnosis and targeted treatment. The above medication should be used under the guidance of a doctor, avoid self-medication to avoid adverse effects.