I am a 19 year old sexually active male. I had unprotected sex with a girl at school about 2 months ago, and i recently found a pimple-like bump on my right testicle. I shave my pubic area and testicles, so I am thinking it may just be an ingrown hair, but I have had ingrown hairs down there before and it looks a little bit different. Is there any other options of what it may be other than an ingrown hair? It came up about 6 days ago, and grows and shrinks some day by day but not too much. I have little bumps around when I shave, and asked the doctor if the bumps looked like an STD, and he said no. One of my good friends got herpes a few years ago, and never found the case of it as he was only with one sexual partner who had been checked previously. I have researched things on genital warts, herpes, gonnorreah, etc. and none of the symptoms seem to match this, but it still worries me. Am I being paranoid, or could it be something more?

Thanks for your advice!!