I have two bumps next to each other on my arm. Both the size of a penny and there is a little bump/blister in the middle of each. Im concerned because i never had tthat before and also i performed cunnilingus on a woman 4 weeks ago and i'm worried she could have given me hiv since i had canker sores in my mouth and caries. The bumps itch and been here for a week now. Theyre getting smaller but i'm worried it could be a symptome of hiv and i had a sore throat.