According to DermNet NZ, acetaldehyde stimulates the release of histamine, causing the redness in the face that a person who drinks alcohol can experience. Acetaldehyde is the chief breakdown product of alcohol. Temporary flushing and redness in the skin is a frequent side effect of alcohol consumption.
Heavy drinkers are more prone to experiencing temporary redness in the face. According to DermNet NZ, constant alcohol consumption can lead the failure of vascular control in the brain, which in turn leads to enlarged blood vessels. As a result, people who abuse alcohol develop more enduring redness in the face, a condition known as telangiectasia. This condition is one of the earliest signs of chronic alcohol abuse.