Is this frostbite? Salmon Faverolle Hen Comb

[Whittni]

I thought maybe it was mud, but I think this is just her comb color now. It's been like this for a couple months and she seems healthy otherwise.

If it were frostbite, I would have thought it'd fall off? Never had any birds impacted, no other flock members have this.

 

[sourland]

Doesn't look quite like Favus, but it may be a fungal infection of some sort?

 

[Whittni]

Not sure, it doesn't seem to bother her and doesn't rub off. I saw on a another post some Favorolle hen had this weird browning of the comb. No answer was ever reached there either.