Are you saying that your face feels hot or that your cheeks are red?
Hot flashes or flushes can certainly make your face feel hot. I'm pretty sure you're not a menopausal woman, Adam W, so I'm not going to blame estrogen for your flushes. But my husband got them too, when he was taking Niaspan for some heart disease prevention thing. Something about the vitamin niacin can give you a flush of heat.