Did they take a biopsy? Did you start any new meds? Any other environmental exposure? new furniture? detergent? anything?

I am certainly no expert on CRPS rash but what I have read and seen photos of seemed to be about rashes local to the CRPS limb. It being everywhere is a big question mark.

Biopsies can be expensive but should ultimately tell you something. I had a weird rash on the TOP of my CRPS foot that was thought to be everything from neurogenic to shingles. Turned out to be a weird looking presentation of athlete's foot of all the embarrassing things...