I've had a "Thermography" done, long ago. I have rsd and tos.
They set you up in a COLD room, with fans blowing on you, this was only done to the upper torso.
The pictures are multi colored, according to the temp.
Of course, I had different colors (temperatures) bilaterally, and front to rear.

As I recall, it was all blamed on the rsd, nothing much to do with the tos.

Hope this maybe helps.

Pete