Jim,
My CRPS is in both my legs from the hip/buttocks to the end of my toes. I too have problems with the affected area turning red/purple with white spots. The white spotting started in the last year, however I have never had the white spots pop before. I know that my CRPS has affected my legs oxygen saturation percentages, as on a good day my legs have only 70% oxygen saturation so I assumed the white spots were related to that issue but sounds like my hunch is way off base. Can you please keep me posted about how this issue works out? Good luck and I hope you get some answers as to why that is happening.
Sarah