Apparently more people have these than I thought. I've got one on the back of thelower joint of my thumb. It's not gotten any bigger or smaller in several months. It's mostly innocuous, but occasionally I'll hit it the wrong way and it'll be really painful. I've thought about getting it removed surgically, but I'm a little worried about damage to the tendon, as I've been told that it's a growth on the tendon.

Does anyone have any knowledge to share?