An ice cube wrapped in a paper towel is an instant anti-inflammatory device, great for holding against a blemish to reduce the swelling. Dab some eyedrops, like Visine, on the blemish (believe it or not, it will get most of the red out, just like it does with your eyes). Be sure to keep your hands off, because heat will only inflame the area. Using a sponge or swab, pat on a thin layer of opaque concealer designed to cover "problem areas" (make sure the concealer matches your skin exactly!) and then cover that with some translucent powder to fully set it.