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Frostbite, the freezing of extremities, is a common danger. According to the National Weather Service, there are four degrees of frostbite: first degree: ice crystals forming on your skin; second degree: your skin begins to feel warm, even though it is not yet defrosted; third degree: your skin turns red, pale, or white; and fourth degree, pain lasts for more than a few hours, and you may see dark blue or black areas under the skin. Gangrene is a real threat.
Here are more tips from the CDC.
December 21, 2011