I found a small, red scab like thing on the bottom right side of my penis yesterday. I noticed it while using the washroom, it kinda stung a bit when i touched it. Today it has hardened, turned more scab like, but has cracked slightly width wise. It's about 4mm in length, and about 1mm in width. It's on foreskin close to the tip when nonerect, and about 3/4 the way up the shaft erect. I had unprotected sex about 4 and a half weeks ago with a girl im kinda close to. She has not mentioned having any infections and so on, but then again I'm aware some people show no symptoms of certain viruses etc. She's only had a couple of other partners other then myself, were both still teens. I was wondering if this sounds like genital herpes or something else? I have to wait til monday to make a doc. appt. I'm really nervous, and don't want to wait to find out if there is anything wrong. Thanks