So my arm with the torn rotator cuff, that I had a horrific flare with but is now calm, broke out in a rash/pustules that looks somewhat like shingles. But covers half my upper arm (the area that got hot to the touch when flared) and goes down my back all the way to my behind. I used sea salt spray and lotion that is drying it out, but is this a CRPS rash? I see my GP Saturday. Thanks.