I was flipped onto the asphalt by an ambulance crew, and my left arm impacted the ground from 5 feet into the air. I was xrayed, no broken bones, but a month later, I have large knots in on the tricep and inner arm. They appear to be fluid related, disappearing with ultrasound and reappearing a few hours later. They are not at the point of impact but farther down the arm. The arm is VERY painful and any resistance causes more of these lumps to appear. What do you think has happened?