I've been having a little more sex than usual with my girlfriend and I've been gettin this weird kinda rash on the left side of my penis toward the bottom away from the head that is, it's kind of red and looks like a couple small pimples? Should i be worried???
What is this on my penis?
As long as they are not blister looking pimples or pimples with lots of fluids you are okay. Otherwise if they are like cold sores, you should look into genital herpes and see a doctor. But seriously if they are just a couple small little pimples don't worry about it.
It could be a couple of different things. While it's true that some STDs come complete with various bumps and blister-ish things, that's not always what it is.
It could simply be a pimple or two. If you used a condom it could be a reaction to latex (a lot of men and women have reactions to latex). Did you notice burning or irritation in the area during the act? If you or your partner (or both) trim and/or shave your pubic hair it could be a heat rash or something similar caused by friction. It could also be caused by friction if it's in the area where the lip of the condom rests on your penis (if you used a condom). Heat rash bumps usually start our as red welts and end up looking like a pimple. STD inflicted bumps are usually either really liquidy or harder than a pimple. The safest advice would be to have it looked at by a doctor. But if you're not going to do that, keep an eye on it.