Favus? Yeast imbalance? Mites? What is this!!

[Chicks_keetkeeper]

The only 14 week pullet affected out of 6. It did that thing where on Sunday during weekly once over it was running round like normal and looked fine and on Wednesday night, it was wing drooping, lethargic, & not going into the coop. I thought it was the heat (it’s 110-118 here), isolated it in broody jail for its own protection (it’s breezy there!) provided extra electrolytes and scrambled eggs and just a chance to rest up and cool off. Today I noticed its feet were swollen and it was worse looking, with a poppy streaky butt, I took it out for further investigation and a bath… It looks like psoriasis but on a chicken ?

The skin is a wreck and feathers are falling out. It’s like, ringworm, or a yeast infection, or mites…? I don’t know what it is! The only one of 20+ hens in this coop (free ranges with 40 birds) with any of this nonsense. The flock is treated twice a year with ivermectin (I just grew up treating livestock twice a year- not interested in stopping or organic alternatives), so at first I dismissed mites but The only thing I could think of is maybe this little girl somehow got skipped on ivermectin treatment day (s)? Or it’s fungal? But it’s all over her whole little body.

 

[Wyorp Rock]

Can you please post photos of all of her and her feet too?

Not sure what causes that, I've seen several post something similar over the years.

I believe @azygous has recommended treating like Cradle Cap using a dandruff shampoo like Head and Shoulders to wash the bird. Worth a try.

The mention of swelling of the feet is concerning. I would also wonder of this may be an avian disease like Marek's or AVL, but it would be hard to know unless you lose her and get some testing.