Erythema on the body after drinking alcohol may be the normal reaction produced by alcohol stimulation, or it may be caused by alcohol allergy and so on. 1. Normal reaction produced by alcohol stimulation: After drinking alcohol, some people may have local or generalized erythema due to alcohol stimulation and accelerated blood circulation, which is usually not accompanied by itching, pain and other discomforts, and this is a normal reaction. 2. Alcohol allergy: some people are allergic to alcohol or other ingredients contained in it, which can cause allergic reaction, manifested as redness of the face and neck, generalized or localized erythema, accompanied by itching, panic, dyspnea and other symptoms. It can also lead to erythema of drinking. There are many other causes of erythema of drinking, which should be taken seriously, and timely consultation should be made to find out the cause of the disease, and further treatment or therapy should be given according to the doctor’s advice.