What Is The Treatment For White Bumps Around The Anus?

My boyfriend has these little white bumps around his anus, I actually sat and popped them like you would pop a pimple and a bunch of puss came out just like a pimple as well. I ve looked all over to see what these may be, as he s concerned because it s nothing we ve ever seen or heard of before. I was hoping to get some light shed on what these could possibly be, if they are infact just little pimples? We re both curious and concerned. I m hoping you have some sort of idea and maybe have an idea of what I m talking about and seeing on him. Ashlee