Hi everybody,i m scared about my skin,i have red pimples on my shoulders some on neck and some of my back side.these are burning somtime.they are not growing bigger but spreading slowly slowly.i did unprotected sex with man 5weaks ago,after two week i checked for hiv and it was negative.I am scared now from these pimples,when i concerned to my GP then he said it's nothing to worry about.these are allergic reaction but i have never suffered with therse reaction.please help if somebody know about these pimples.