S.P.
I would wait a few days and see if it spreads or begins to go away. There is a virus that is part of the smallpx family that causes bumps, usually on the torso area. The bumps can stay for almost a year but are not contagious except through scratching. My daughter has one on her belly (looks like a pimple with a hard white spot in the middle) and the doc said it will eventually go away. Aveeno bath works great on rashes.