What the cause of this on her back

[GooseBee]

I just noticed last night, I feel so bad. Is it from the roosters? I put wound spray on her. She peck really hard at me and she usually doesn’t that. She bites light. It probably hurting her. I feel so bad. What cause of it so I can figure out what to do. I tried google it but is so hard trying to find an answers to what it is. Also don’t mind her dirty back. I already know I have to clean wound and then spray it. She loves her dirt baths.

 

[Lacy Duckwing]

It looks like scabbing, which could be from the rooster. If it is, then you might have other hens with scabs too. You can put a saddle (aka hen apron) on her back to protect her, and the rooster's spurs and possibly nails might need to be trimmed. Where is she in the pecking order? I'm doubting this is the case, but is any hens bullying her and pecking her there?

 

[GooseBee]

It looks like scabbing, which could be from the rooster. If it is, then you might have other hens with scabs too. You can put a saddle (aka hen apron) on her back to protect her, and the rooster's spurs and possibly nails might need to be trimmed. Where is she in the pecking order? I'm doubting this is the case, but is any hens bullying her and pecking her there?

Oh ok. I will get one and I will trim roosters nails. She is third to last in pecking order. The hens only peck her on top head but there was few times they peck her in back by other hens.