Urgent - What’s wrong with my hen? Mites?

[pvchicken1]

Yesterday I noticed a black circular spot on my Pita Pinta’s back. She is 6.5 months old and lays an egg almost everyday. She’s never slept on the roost like the other chickens. I attached a picture below. I think it’s an infected wound with mites. I think I should dip all my hens and treat them for mites. What do you think?

 

[Sally PB]

I think you might have flystrike, because I think I see maggots. This is serious, even life threatening if that's what it is.

Here's an article about it.
https://www.backyardchickens.com/articles/how-to-cure-flystrike.77839/

Here's another one.
https://www.backyardchickens.com/articles/what-to-do-when-your-flock-is-struck-by-flystrike.78243/

 

[Eggcessive]

Do you have a rooster who may have pecked her or pulled feathers? Can you see any moving mites or lice on her skin?
Sorry, I just saw the post about possible maggots. Do you see any maggots in the wound?