frostbite
frostbite Freezing of living body-tissue in sub-zero temperatures. Frostbite is an effect of the body's defensive response to intense cold, which is to shut down blood vessels at the extremities in order to preserve warmth at the core of the body. Consequently, it mostly occurs in the face, ears, hands, and feet. In superficial frostbite, the affected part turns white and cold; it can be treated by gentle thawing. In deep frostbite, ice crystals form in the tissues. The flesh hardens and sensation is lost. It requires urgent medical treatment. No attempt should be made at rewarming if there is a risk of refreezing, as this results in the death of body tissue (gangrene).
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frostbite
