I have a couples bumps about the size of pencil eraser on my fingers. They are skin colored, maybe a little bit of white and have come and gone for years. They have been getting a little painful (sore and sting a bit when i touch them)and itchy. I think they come when a lot of pressure is put on a finger, and normally there is only one per finger. Right now, both thumbs, both index fingers, and one middle finger have a bump. Once one has arised, normally a few more pop up. What could this be?? Please help..