From wikipedia
Alcohol flush reaction (colloquially referred to as
Asian Flush,
Asian Red or
Asian Glow) is a condition in which the face and/or body experiences flushes or blotches, due to an accumulation of acetaldehyde. The acetaldehyde accumulation can be caused by a missense polymorphism that encodes the enzyme, acetaldehyde dehydrogenase (ALDH2),[1] normally responsible for breaking down acetaldehyde, a product of the metabolism of alcohol.