Just recently I noticed some soreness above my right breast and below my collar bone. It s slightly painful to touch (really just sore). When feeling both sides, it appears more swollen on the one side and it feels as if it is right on the bone. I m 39 years old with history of hashimotos thyroiditis, osteopenia, liver lesions, PCOS, and kidney stones. Any ideas? I have not done anything recently that would have caused a pulled muscle that I am aware of.