I found one about a week ago right underneath my collarbone- the bone itself. It didn't hurt or anything. But now it's actually gone down in size. I was just wondering if it could have just been an infection of some sort? I mean I know they're caused by infections, cancer, etc. So I wasn't sure. I didn't know if with cancer, if they'd go down or not. So basically, should I get it checked out? It's smaller by almost half it's original size, so I'm worried it'll be completely gone if not barely noticeable when I do go to get it checked out and the doctor wouldn't be able to do anything.