Avoid rewarming by open flames or heaters. The injured tissue can easily burn and worsen the damage. You can expect the rewarming to be painful. Medicate as needed for pain. Rehydrate the soldier.
Intravenous fluid is ideal.
Fluids can be given orally if the soldier is awake and alert. Protect the injured part with soft and bulky dressings. Do not use constrictive dressings. Keep sheets and blankets from resting directly on the injured area. Keep blisters intact until the soldier can be evacuated to a medical treatment facility.