It does look like what I see sometimes. It's weird because sometimes the color difference is subtle (like a slightly more red/purple color) and sometimes it is drastic (dark red/purple). It is worse if I have immobilized the foot at all (when I was wearing a boot I had a lot more days with the color changes and with the leg getting ice cold). I remember going to physical therapy for pool therapy and the temperature difference was so great that to my right (non-RSD) foot the tile on the floor felt really cold...but to my left (RSD) foot it actually felt HOT. And these things were worse with the immobilization and the boot. Even once I stopped wearing the boot, it took a few months of physical therapy before they got to the point where I only had them with bad flares.

Now I get the same things in my upper body too...but because I make sure not to immobilze the symptoms of color and temperature change only come with flares