Mono Rash Elbows What Could A Raised, Red Itchy Rash Mostly On The Upper Body Be? Also Came With A Sore Throat.?

What could a raised, red itchy rash mostly on the upper body be? Also came with a sore throat.? - mono rash elbows

I was 2 and doctors - a blood test because I thought it would be nice, but my blood was fine, and I have a sore throat (test done), gave me an antihistamine. Another doctor was immediately treated with scarlet fever and gave me penniccillin (which is a little help so far), but I've never tried anything (scarlet fever is a form of STREP. .. But I'm negative) for STREP. I probably misdiagnosed, but nobody knew what it was?: Sore throat / swollen tonsils, which came later with a maculopapular rash itching and redness at the elbows, arms and back, back down on his stomach, thighs? I'm allergic to everything and still have not eaten anything different in my body, or the use of different soaps / detergents. I think it's cogensIs there some kind of virus.
I would appreciate answers that told me I was a misdiagnosis (because we know what is possible), and would feedback from people who have lived this experience, or rather in the field of medicine