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Alcohol dilates peripheral blood vessels, but has been known to actually. constrict some blood vessels in the brain, lowering the oxygen content. Alcohol dilates peripheral blood vessels, but has been known to actually  constrict some blood vessels in the brain, lowering the oxygen content.
Alcohol Rash. Some people notice that their skin starts to turn red when they are drinking alcohol. This can be embarrassing, particularly if you happen to be out in public when this occurs. As you drink alcohol it can cause the capillaries in your face to dilate, increasing the blood flow to these areas.In some cases this reaction is quite mild and hardly noticeable but in some cases an alcohol rash can be quite severe, leading to itch, even lesions on your skin or severe inflammation.n this case acetaldehyde, a derivative from the alcohol will cause the body to flush, causing what is known as an alcohol rash. When the rash appears it can cause patches to appear on the skin, often on the face, chest, back or neck.