I wonder if this is akin to the B3 or niacin flush. If I take niacin I turn red, really hot, and swell up all over. It last for hours.
Niacin does that to anyone — in a high enough dose. I’m taking a 500 mg and any resulting ruddiness is not so noticeable that I’ve, uh, noticed it. :’) If you are taking it as a prescribed supplement, ask the physician or other practitioner if it’s okay to cut the dosage.
Alcohol, btw, is a vasodilator, which is why drinking the demon rum and the like makes one feel warm — the capillaries are near the surface, as are most of our nerves. It also means that we’re losing heat, so you get to feel nice and warm as you freeze to death faster (y’know, in a cold climate).