Heat rash?

Sheila

I get this anytime I get overworked, hot; I also noticed if I'm stressing over something it will happen too or if it's hot outside or inside sometimes I break out. It's random. Sometimes on my face and neck kind of reddish spoltchy, with a bit of a burn or ion my leg or back or butt. Is this a heat rash, hives? What do y'all think?