Maybe it's the thick of summer and you're attending an afternoon game at the ball park. You think, "Why did I wear long pants in this weather?"
If you've ever noticed stinging, red dots when taking off clothing after being in the heat, you could be looking at a heat rash.
Mostly harmless, heat rashes occur when the natural process of sweating is blocked, often by wearing tight-fitting clothes [source: Mayo Clinic].
While some heat rash looks like little red bumps, other cases could be small bumps filled with clear fluid. Again, not to worry, heat rash is not dangerous.