I have a 9-month-old serama roo, he was living outside, and I was prepared for his comb to get frostbite, but his left foot developed 3 blisters/bubbles. One large one between his middle and right toes, a smaller one between his middle and left toes, and a very tiny swelling above his back toe. It might be important that I also think my flock had either mycoplasmosis or coryza in the months leading up. So I brought him in the house, and I let him warm up over night and in the morning I soaked his foot in warm water. The quick of his right toe was dark, and his foot was gray (normally a vibrant yellow) to just below his spur. When I soaked it and rubbed it to get dirt of, 3 scales loosened and fell out. That was the 19th, today is the 28th. Over the course of 9 days, I think his foot has slowly died. He's been getting a soak in warm water everyday, and I was putting bag balm on it, but it doesn't appear to be helping. I have polysporin triple-antibiotic, bag balm, liquid bandage, and rubbing alcohol. I at first thought frostbite because it has been getting so cold (-25C during the DAY), and they aren't in the best shelter, because it took us this long to find the wood we needed for our big coop project. I don't want to lose this guy, he's quiet, good to the hens, has the best type of any of my seramas. His foot is now an iguana-green, puffy looking thing. All of his toenails are dark, and the big blister popped somewhere around day 4. He doesn't use it, he just tucks it up under himself.I can see that it causes him pain when I touch it. The bottom pad is larger than the pad on his right foot and stiff-feeling. The gray/green has started to move up his leg. His other foot looks completely normal There is no bumblefoot scab as far as I can see. The things I think could be causing it are frostbite, mycoplasma synoviae, blood clot, and bumblefoot. I will try to get a pic next time I soak his foot. If anyone could help me figure out what to do or what it could be, I thank you!