I have a nervous habit of biting the skin on my thumb's knuckle. Over time, it turned red and raised up. It almost looks like a pimple or a red wart. It's rather large. I've included a picture. Any suggestions on a way to get rid of it? I've stopped biting it.
Thanks.
The picture does not show the size or redness of it very well. But it gives you a look at it.

http://s235.photobucket.com/albums/ee123/Mordeki12/?action=view&current=thumb.jpg