Analysis of illness: Alcohol allergy is an external skin allergic reaction caused by the lack of acetaldehyde invertase in the body. The two necessary conditions of alcohol allergy are allergic constitution and alcohol, and most allergic constitutions lack acetaldehyde invertase. Alcohol, that is, ethanol, is converted into acetaldehyde in the body. Because of the lack of acetaldehyde invertase in the body, it can no longer be converted into acetic acid, so it causes acetaldehyde poisoning. Guidance: Don't drink alcohol on an empty stomach, because alcohol is absorbed quickly on an empty stomach. After drinking, you can try to drink hot soup, especially fish soup stewed with shredded ginger, which has a special hangover relieving effect. Never drink alcohol after taking medicine, especially after taking sleeping pills, sedatives and cold medicines. Antihistamines and hormones are commonly used to treat allergies, which can generally relieve allergic symptoms quickly. It is recommended to take loratadine.