I have had upper left backpain that was helped with a Chiro and also massage therapy. Recently went to a narrower bar and that also helped. Pain is now all gone. My Chiro does myofacial release and limited manipulations, he is also a cyclist. I have never left his office in pain and have never been worse from his treatement; so, the OP's bruises are inconsistent with my experience. How a Chiro could bruise your arm when addressing upper back pain is beyond me.