I had a slip and fall on the 16th of Feb., and had shoulder pain. Over the past 2 weeks I've developed a bruise on my upper arm (this is all on my right side) that is purple and yellow, and the pain has spread to my chest. There is a bump under my skin on the front of my shoulder, but no bruising there. Moving my arm in certain ways is painful, and any circular shoulder movement feels like grinding and I can hear popping sounds. Can you explain what's going on?