What is this, and why is it on my body????????????

So, This "rash" has got to go, I can't stand scratching min stop and it burns to even touch it....I NEVER do this and I don't understand what it could be, before anyone comments I'm going to go ahead and rule put a coup of things, I know it's not stress because I'm mother stressed, it's not an allergic reaction because I'm only allergic to penicillin and the TB vaccine in which I have has neither, the only thing not normal about me right now is I'm 3 days late for AF other than that everything else is pretty much normal....it's spreading and I don't know how to stop it....any ideas??