What Are The Bunch Of Little Bumps All Over The Penis?

I am a females & my boyfriend came over & we were about to have sex but I noticed he had a bunch of little bumbs all over his penis that I never noticed before. Even though we use condoms I didn't want to have sex with him because I didn't know what they were. To be quite hoest I was to afraid to ask him what they were. Do you have any idea what they could be?