bony lump on collar bone
Hi, I just recently lost a lot of weight and can now see my collar bones clearly. I noticed that my left side is noticeably different than my right. There is a distinct lump on my collar bone close to where it meets my shoulder, but not meeting my shoulder. It feels hard, like part of the bone. The muscle under it feels a little bit swollen but it could be my imagination. It isn't causing any pain. I am not able to move it.
I've never injured my collar bone or my shoulder, to mine or my mother's knowledge. What could this be??