Some people blush after drinking alcohol, while others don’t change their color or even blush. This is actually related to the process of metabolizing alcohol in the body. Those who blush tend to be more impervious to alcohol. This is because the enzyme acetaldehyde dehydrogenase has made a mistake, resulting in the metabolism of alcohol is slowed down, blocked, too much accumulation of acetaldehyde, acetaldehyde retained in the body to stimulate vasodilatation, which leads to the face and other parts of the body of the skin hair.