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, usually drinking alcohol 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, can make the whole body of the skin capillary expansion, 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, and this redness usually recedes within 1-2 hours after drinking; 2, if the body is red with itching after drinking, 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.