4You break out in hives

Splash cold water on your skin frequently or switch to activities in air-conditioned locations. The flush usually disappears about 30 minutes after you stop exercising, but if you have persistent redness, you may have rosacea, a skin disease that causes flushing, redness, bumps, and pimples. It can be treated with oral and topical medications.

Yes, you really could be allergic to exercise. Urticaria is often triggered by sweating and an elevated body temperature.

See a specialist to rule out other conditions. If it is urticaria, your doctor may recommend taking an antihistamine treatment