.For about 3 days I've felt a tingle on my upper back..it was a weird feeling and then it would be itchy..didn't think anything of it and lastnight,i finally looked at it..it's a small patch thats a little discolored and red...

Doing 500 test e.on my 4th week..

I never tan my back, except when I ride my bike, cardio..but always wear a shirt...
Could this be ANYTHING from gear?
Thanks bro's