I have a hard lump on my left rib about 4 inches above my left breast that I noticed several months ago. It feels as hard as bone and pretty much has the same contour as a rib but feels a lot different from the right side as it protrudes more. It starts pretty much on my sternum then extends to the left about 2 inches, then the area is flat again. It feels like it might be wider than a normal rib too. I can't move it around. I know the description is sort of vague, so thank you! I would just like an idea as to what this could be.