One of my ladies got a bit of frostbite the other day. We completely revamped the coop ventilation, added a monitor and she seemed to be doing well. I sprayed a little Vetericyn during the warmest part of the day before obsessively researching and seeing that group consensus was to let it be. I checked on her tonight after work and in the areas that got the bite, it looks almost like there's dried mud on her comb. Is this normal for healing frostbite?