Frostbite (congelatio in medical terminology)'s the medical condition wherein localized damage's caused to skin and other tissues due to extreme cold. Frostbite's most likely to happen in body parts farthest from the heart and those with large exposed areas. The initial stages of frostbite are sometimes called "frostnip". Mechanism At or below 0º C (32°F), blood vessels close to the skin start to constrict. The same response may also be a result of exposure to high winds. This constr… (More on Frostbite)