Patched area on silkie’s back

[Benjelly]

I recently saw that my silkie’s back looked a lot darker, today I saw that it was a patchy streak along it’s back. Does anyone know what this is?

 

[Wyorp Rock]

Looks like you have added the question about this bird to your other thread.
It would be great if you include more photos on that other thread that shows the areas of concern.
Thank you.
https://www.backyardchickens.com/th...-and-i-need-help-on-how-to-help-them.1429293/

 

[Dephora]

Have you checked for mites and lice? Could be anything otherwise. It could be getting pecked by others or could be damage from a rooster. But you should try to rule out pests.