For about a year now I've had a bump on the underside of my penis. Just under the head on the bottom of it. It doesn't cause me any pain or discomfort and I can only tell it is there when erect. At first I thought it might have been just a swollen gland and maybe it is. When erect it seems to harden, but still causes no discomfort. It's not large, but it's just present. I haven't seen a doctor as it's caused me no real issues. Just wondering if anyone had any insight or idea as to what it might be?