On Saturday, (today is monday) I noticed a small bump on the shaft of my penis, When I picked at it some puss came out as if it were an ingrown hair or a pimple, I am not sexually active, I tried to pop it several times since but it just seems to be skin at this point, it is a noticeable bump. I got the flu shot and the swine flu shot about a week ago. It popped up out of nowhere. Would this have anything to do with my flushots? I haven't shaved there in about a month so I'm not sure if that is it.