What Causes Reddish Bumps On The Shaft Of Penis?

Hi, may I answer your health queries right now ? Please type your query here..My boyfriend told me that he has two very small bumps on the shaft of his penis, they are reddish he discribed like bug bites with a black center
I just had canker sores recently and we and oral sex... but he said they look more like blackheads then a sore. What could they be?