Hi, I have a large cartilage-like bumb on the underside of my penis just below the head. It is as large as my thumbnail and I have had it for as long as I can remember, but have only recently realized it is abnormal. It is not painful at all, and is covered in skin. I cannot seem to find any disorders or diseases which look like it. It is definitely not molluscum contagium or peyronies disease. Thank you