However, it may take some time for frostbitten areas to get full sensation and strength back. Sometimes, numbness at the tips of fingers or toes does not improve. A body part that has been frostbitten will get colder faster than other parts in the future. You may not know the full extent of damage to frostbitten areas for about 6 weeks. Permanent damage may result when blood vessels are injured.
Tissues then die because of the lack of oxygen, and the dead tissue can become infected.
If you have gangrene, which can be fatal, the dead area may have to be amputated. However, amputation does not have to be done in every case. Often the blackened areas of severe frostbite heal if they are cared for properly under medical supervision. You can best prevent frostbite by being prepared and dressing appropriately. Be sure your clothing provides protection for your head, ears, nose, hands, and feet.