Recently I gave oral to this girl at a college party. She's 19 and I'm 20. A day and half later I had a sore throat and when I worked out I had a red rash on my arms and chest. It would only come when I worked out and it was red, not itchy, not raised, not bumpy. That week, I had a cold like symptoms and very low grade fever (99.5) with other cold symptoms, including a cough, but not much mucus (no runny nose). Two weeks later, the rash appears in the same fashion but just on my chest and not itchy, not raised, and not bumpy. It comes and goes, and the same girl said she had a cold the same week I just did and she said she had no STD's, but I am worried since I don't really do that that often. Should I be concerned? Throat is still raw but not sore, just appears reddish in color.