I have something of an anatomy question. My kitty (11mos now) has a little bump at the tip of his tail. It's at the very end, on the side. I was just wondering if this was a natural shape of the vertebrae? I have looked at it an its nothing on top of the skin, its under. Nor does it bother my kitty to be touched there. I have no other cat to check this on, but is this a normal lump, just the way the bone is formed, or is it something I should get checked out?