Human skin temp at it's highest and lowest

Question

what is lowest and highest human skin temp

and do thermal cameras detect the skin temp or the internal body temp

do they like just detect the internal because the infrared like just passes thru the skin

Answer 1

Dead or alive? Has anyone carried out detailed measurements of mountaineers skin (and frostbitten skin) climbing in the "death zone" of Mount Everest for example? For good reason... It would be impossible to do so. The same might go for a person at the limits of endurance in the heat of Death Valley.

The point is that while the body maintains homeostasis and regulates internal temperature/body core temperature within narrow limits when all is well; the same can not be said for the surface temperature of the skin which is subject to fluctuation dependent on ambient environmental temperature.  

Answer 2

Skin temperature can vary widely. It is really hard to say what the highest and lowest skin temperature could be. It is much different than core temperature which MUST be kept at a near constant (around 37C)

Thermal cameras do not irradiate infrared light, but instead pick it up. Therefor what is irradiating from the skin is what is being seen.