Yellow Scabbing

[titosfarm]

Discussing the same hen in my previous posts, we gave her some Tylan tonight to treat her respiratory issues. As I was going to inject into her breast, I noticed her skin had lots of yellow crust on it at her the base of her feathers. We have already checked her for mites, and she has been plucking her feathers. I don't know if it's due to isolation and stress, or if she has underlying issues. Someone please help.

 

[titosfarm]

This was not an issue until today! We inspected her 2 days ago and she appeared completely normal.

 

[OwO]

One of my older girls has something fairly similar, though not quite as much of it. Does yours want to start preening when you touch her as if it irritates her?