If you have to go out, dress appropriately. That means wearing mittens, warm socks, and a hat that covers your ears. Also, know the signs of frostbite and what to do if they appear on your skin or someone else's. Sometimes, for example, the method you use in an attempt to rewarm frostbitten skin can do more damage to tissues than the frostbite itself would do. It's also important to know that hypothermia, a dangerous drop in the body's core temperature, often accompanies frostbite and must be treated first, before you try to rewarm frostbitten skin.
Skin remains numb during and after rewarming.
Find a warm area quickly. Never rub frostbitten skin. Immerse in a tub or basin or apply compresses. Rewarming can be painful. If immersion is not an option, remove clothing from frostbitten areas and cover with blankets.