My little banty rooster's comb is bloody and shriveled up looking; also black around the edges. Is this frostbite? He's been through worse winters, so I'm puzzled. I brought him inthe house for the night, he is staying downstairs. Any advice please? Should I just put him back out there? Will the other chickens get frostbite too? Advice on medication? Again, these chickens have lived through worse conditions.....so I'm confused.