We have just come out of an unprecedented cold snap. My flock came through the low temps relatively unscathed. My main rooster has a dark edge on its right wattle. I believe the dark edge to be evidence of a slight case of frostbite. Here is a couple of pictures. Is my diagnosis of frostbite correct? Thank you for your analysis.
We had a mild winter last year and he got just a bit of the superficial duskiness that yours has there. Very little affected. But not so lucky this winter. It sucked the wind out of him a little bit too. He didn't want to roost for me and a little bedraggled. I worried a bit about him. But I brought him up for mini warm ups at the house and scrambled egg to give a boost nutritionally I hoped. Spiked his water with some electrolyte and probiotics. I think we've got him through the worst and just a matter of the eschars dropping. It's a tough process but they pull through it.