Tracy, I get this too... it's wherever the pain is. it looks like a cat clawed my shoulders or chest and there are red spots from it. I'll try to get a pic and post here later, but am on my way out for a day. For me it's almost always there around my shoulder capsules and is very tender to the touch. and frequently goes across my chest above the collarbones.
The way it was explained to me (can't remember who: Dr or PT) is that when you have pain in the same place for so many years, acids build up in the tissues that kind of attack your body. Make sense? Am I wrong? Comments?
Hang in there - it's all we can do.
Anne