Just noticed a hard lump toward the middle/above my left collar bone. It s about the size of a pea, is hard, moves, and is painful to touch. Any ideas? The only history I have is when I was younger, I had several cysts in my jaw (the type was something like Odontagenic Keratocysts - spelling? - abbreviated OKC), but I haven t had those in over 14 years, not to mention the fact that they were in my jaw, not my collarbone.