Don't shave, as it is it could be an ingrown hair and messing with those can cause major infection.... Can even kill you. See ob-gyn
Go to the Gyn. They'll do tests. In the meantime take warm baths. Relax. Shave the area to get a better look.
A condom was used and it is not a std because it was also his first time
If there was no condom used, I would go see you gynecologist! save yourself some stress.