Frost bite is treated no differently than a thermal burn other than it takes longer to know what amount of tissue will be lost/scar. Keep the area dressed with some antibiotic ointment and avoid refreezing it at all costs. It will either heal, scar, or need to be skin grafted depending on the depth and extent of the frostbite. Blisters that are thin walled and filled with clear fluid are a good sign- blood filled blisters indicate deep tissue injury and will likely scar.
Good luck
