I need help

Hi everyone, I’m looking for some advice on one of my hens.

She’s a female, just about a year old, and recently I’ve noticed she’s not looking as well as the rest of my flock. Her comb is a bit darker than the others, and there seems to be some mild swelling in her face along with small speckles on it.

Behavior-wise, she’s definitely off. She tends to stay away from the roosters and avoids any related interactions, sits puffed up in the corner a lot, and isn’t very active. When I come near, she runs to me, tries to hide, and wants to be picked up constantly. She just doesn’t seem like she’s thriving the way she used to.

She is still showing interest in food and water and appears to be eating and drinking normally.

For context:

• The rest of the flock appears completely healthy

• No signs of mites or lice

• I recently treated the flock for coccidiosis (another hen had it)

• I’ve checked her feathers and vent thoroughly and didn’t find anything abnormal initially. (more on this later in the post.)

• I also recently had another hen isolated for a possible respiratory infection and wry neck

I’d appreciate any guidance possible. She’s quite special to me. And I will do whatever I can to help her. Please help.

Recent update….. I isolated her from the flock and started her on some basic vitamins, vitamin E B12 and selenium as well as antibiotics. She’s on day 5 and today a few days ago I noticed she was pulling feathers out on her side upon further inspection. This is what the irritated area looks like….

I have since put a makeshift onesie on her out of a sock to keep her from accessing the area. But she doesn’t seem to be getting any better.

I know she’s bothering the little green tag on her ankle, it’s there for identification purposes. It’s already removed.