Hi Alt,
Yep! My big toe and the next one on my left foot have been turning dark brown. The second toe's nail is also growing very thick and weird looking. When my neurologist looked at my foot she said that RSD is beginning to spread to my foot.
Since I saw her last month the pain in my lower leg is increasing and now when my wrist/hand, where the RSD started, starts burning pain so does my leg and foot.
When I read or hear someone say "RSD doesn't spread" I laugh because we all here know from experience that it does.
So you're not alone my friend...