I can properly treat a rash?

Rash most common product: question caramel : How can I successfully treat a skin rash I suffered from a terrible rash (all on my back, ears, neck, arms, thighs, belly, it's over). I am ashamed to say this, but I'm broke to go see a doc now. ISTS pharmaceutical say it's because I identify myself allergic to some thing, but I am not what I am allergic. I can not sleep well because of the itching, although I took some antihistamine tablets. I am often exhausted by the day. can someone please

Itching Urticarial Rash