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Found Gabby this morning like this. My girl's free range so I don't know how long this has been going on. We've had nothing but rain in central FL for more than two weeks. Coop's are clean and dry. No sneezing or mouth breathing. Fungal?

@Herne you need to post that picture here.
https://www.backyardchickens.com/forums/emergencies-diseases-injuries-and-cures.10/
I can't offer any help, but it will likely not draw any traffic or answers simply adding it to your media collection. I hope she get some help, poor girl.

This is Fowl Pox.
It will have to run its course but you will need to keep a close eye on the inside of the mouth to make sure it doesn't get bad in there and prevent her from eating.

Well I'll be a monkeys uncle... There ya go.

Also...it's caused by mosquitos and once the flock has suffered from it once they should not ever get it again.