Medical term for tissue damage caused by extreme cold. In everyday use, 凍傷 typically refers to frostbite, while しもやけ is more common for chilblains.
I got frostbite while mountain climbing and lost feeling in my fingers.
For treating frostbite, it's good to warm the area slowly with lukewarm water.
frostbite victim; person with frostbite
Compound of 凍 (freeze) and 傷 (injury, wound). The reading is on'yomi for both characters.