My Black Sumatra hen got frostbite in her toes up to the first joint about a week ago when it snowed a ton. She seems to be walking ok but has lost the end of one of her toes and. I only noticed one other toe that was black, shrunken and dry-looking when i tried to examine her this morning. Is there anything i should do to keep infection or something like that away? I've only dealt with Frostbite on the comb before. I can get a picture later if necessary.