It depends on the degree of frostbite. First-degree frostbite can be treated by rewarming the skin in a warm-water bath. If the skin is numb, be sure to test the water to make sure it is not too hot. The water should be slightly warmer than room temperature. Once the skin warms up, it will likely be wrapped with a sterile dressing.  More severe forms of frostbite may also require oral pain medication, antibiotics, and anti-clotting drugs to improve blood flow. In third- and fourth-degree frostbite, damaged tissue may need to be removed several weeks after the injury, and physical therapy may be necessary.