If medical care isn’t around
If medical care isn’t immediately available, wrap the affected areas in sterile dressings, carefully separating injured fingers and toes from each other. But try to move the affected areas as little as possible to avoid further tissue damage.
If a frostbitten area is warmed and then refrozen, damage can be even more severe. According to the US National Library of Medicine, if refreezing is not guaranteed, it might be best to delay the initial warming process until a warm location can be found. Warm drinks are best for replacing lost body fluids.
Two more warnings from the CDC: Don’t rub with snow or otherwise massage any frostbitten areas. You’ll just make any tissue damage worse. The same applies to walking on frostbitten feet or toes, so avoid that unless absolutely necessary.