I have a hard, painful lump in my back (flank?), just below the las rib. It has been painful for about 4 months, off and on, and become constantly painful in the past few weeks. It is hard, seems to be oval shaped? and feels a lot like a pulled muscle, pain wise. It is painful when pushed on, and seems to be more pronounced and painful to touch when I lie on my right side. I have a back injury in that area that has never really healed, and I wondered if scar tissue could form in that maount and be that painful?