When exposed to very cold temperatures, the skin and underlying tissues may freeze, resulting in frostbite.
The areas most likely to be affected are the hands, feet, nose, and ears. Frostbite is distinguishable by the hard, pale, and cold quality of the skin that has been exposed to the cold. As the area thaws, the flesh becomes red and painful. If your fingers, ears, or other areas are frostbitten, get out of the cold. Warm your hands by tucking them into your armpits; if your nose, ears, or face are frostbitten, warm the area by covering it with dry, gloved hands. Do not rub the affected area. If numbness remains during warming, seek professional medical care immediately.

If you are unable to get immediate emergency assistance, warm severely frostbitten hands or feet in warm--not hot--water. (The water should be between 100 and 105 degrees Fahrenheit).