So weird. I never thought I would hear someone saying something similar to what I am going through. I am in the middle of a severe flare-up of PMR, and I have had an area on my back left shoulder-blade (yes, you're right, around the bra strap) where it is constantly itchy. It almost feels like something moving underneath the skin, I know that sounds strange. I have had this since I got this flare-up. I thought I must have gotten bit by something. My husband says there is a small scab there but nothing else. I can't give you any answers, just that mine coincided with getting the PMR and never subsides. I find this too strange....