I'm not so sure about this "paper" as far as saying MS and CRPS is the same?
But CRPS has many co-morbid conditions. I have a small rash on both feet that the Dr. called a CRPS rash. But it isn't large and nasty, thank goodness. I've seen pics of bad ones and ones that get infected, etc.
If you feel strongly it isn't eczema but CRPS related then see the pain doc instead of derm. Cause frankly a dermatologist isn't going to know what to do IMO.