You're asking and I'm answering . . .
After I run in hot weather, my face turns so bright red. I stay hydrated, and I do feel hot, but not overheated. The friends I run with get slightly flushed, but not as scarlet red as me. Is this OK, or is this a sign that something is wrong?
—Rosie Red Rebecca
Don't worry, nothing is wrong with you. That ruby-red flush is just a sign that you're working hard and building up heat. When your temperature begins to rise, your smart little body perspires to keep itself cool, but it also dilates the blood vessels in your skin to reduce your body temperature (it's called vasodilation). This circulates blood to your skin's surface so that heat can radiate off of it. So have no fear — your face turns bright red because warm, oxygenated blood rushes to it as a way to prevent you from overheating. This is a good thing and nothing to be worried about.
To learn when a flushed face might be an indication of a problem
If you notice other signs beyond a flushed face, like feeling exhausted, feeling dizzy, sweating more than normal, or are sick to your stomach then you may be close to heat exhaustion. If that's the case, stop exercising ASAP, get out of the sun, loosen up tight clothing (or remove it altogether), and drink plenty of cool water.