Can you describe the bumps some?
I LOOKS like there are tiny white bumps on there. I know a guy who gets those. They come and go and are not uncomfortable. He has been tested 2 years ago as well as recently for STD's and they have not found anything. They COULD perhaps be just clogged pores/whiteheads. You do have pores all over your body and when you sweat it's easier for them to get plugged. Just try keeping it clean and see what happens.
You can also check out the symptoms of all the different STD's
here
I can assure you that those little bumps do NOT look like warts to me.
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