I am a 14 year old virgin and I noticed a very large bite looking bump on my penis shaft. It doesn't itch or hurt. I checked to see if it is an ingrown hair and it isn't. I have recently went hiking in hillcountry but only noticed the bite when I got home. I also have dogs that have fleas that we are treating right now. So is it a bite or a STD?

Have you had sex yet? No? Then how could it be an STD?

Your best bet would be to see a doctor if you're worried about it. It could be anything from a pimple to a bug bite, there is no way for us to know.