Why am I itching all over?

Ok so I've been itching in almost all parts of my body (mostly above the legs, though). The itching gets extremely intense when I feel embarrassed or when I exercise. Typically, I feel hot when that happens too (maybe it's heat related?). There are no rashes, hives, etc. Just the itch. I doubt that it has anything to do with allergies but if it does, there's only one soap in my house that could be the cause and I will attempt to test out that hypothesis. So if anyone could throw in some possibilities, that would be great. Thank you.