The redness of the whole body after drinking alcohol should be considered in a variety of situations, as follows: 1. To consider the lack of acetaldehyde dehydrogenase, the wine usually consumed contains a large amount of ethanol, ethanol in the body under the action of ethanol dehydrogenase to form acetaldehyde, and acetaldehyde has the function of capillary dilation, which can make the skin capillaries throughout the body expand, resulting in the phenomenon of redness. If the body lacks acetaldehyde dehydrogenase, it will lead to a large accumulation of acetaldehyde in the body, resulting in redness, which usually recedes within 1-2 hours after drinking. 2, if the body is red with itching after drinking alcohol, consider the alcohol-induced allergic reaction, the clinical manifestation can be edematous erythema, wind, usually accompanied by intense itching, at this time need to take oral antihistamine treatment, itching obvious If the itching is obvious, you can use topical glycomet lotion.