every rsd/crps specialist i have seen have said that bone scan results are inconclusive without further testing. as some others have mentioned block results are far more significant.
in college i had a flare and went to see a local neuro who had me do a bone scan and when those results were inconclusive he told me it was indicitive of a non rsd/crps related problem. from what i have read about bone scans the use in diagnostic testing for rsd was basically the idea that soft spots were indicitive, has anyone had a pain specialist tell them what exactly the relationship between a bone scan and diagnosis might be? i have had a few scans over the years and the results have never been exact...i have always wondered what they were looking at and why the results very so much.
anyway back to your symptoms (sorry i am good at getting sidetracked) as someone discussed i only have significant color changes following introduction to warm or cold water or hot and cold packs. i did have obvious temp changes when my before block and after block extremity temps were compared 3-8 degrees. most of the time i have only minor swelling. the most obvious symptoms i have always displayed was the rediculous amount of pain any amount of touch would induce. back in 1990 when i first displayed the symptoms most of the doctors i saw thought that nerve damage was the cause.