If you've gone to the beach and witnessed a large gust of wind, you've probably felt how it stings against your bare legs. If you haven't, it's not very fun. When my body heat is too high, I get that same feelings in various parts of my body. It's like an itch, but very intense and annoying. It's caused by things like the sun, being too close to a heater, blushing, and even eating hot wings. All of those involve heat, so I'm assuming that's what causes it.