I wish i lived closer - we have a automotive laser temperature gun - I used to test my arms and neck and shoulders for temp discrepancies.

Anyway I think some drs/ chiros have a thermography {sp??} machine??

I don't know if the general personal temperature lasers {for fevers} would work the same I've never used them-
but it would be interesting to get some readings to see if hands and feet are actually cooler than the norm or if it is your perception of them being cooler.

for personal TOS experiences - when I raise my arms way up or way out to when the blood gets stopped, it does seem to feel cooler and they get whiter, but as soon as I lower arms the blood rushes back and will feel warmer and flushed pinkish.