Hen has large portion of skin missing/injured...

[KirBear]

Today I was walking out to my coop, to close up the chickens for the night, and when I checked to see if they were all there I noticed some bleeding on one of my hens. She's a Rhode Island Red, of regular weight, and is definitely my sweetest girl. She loves to cuddle, and she is also definitely our rooster's favorite, and has been missing back feathers for a while.
I picked her up and took her to our garage to take a closer look, expecting a scratch, but it was much worse. A large, two inch, circular wound was hidden under her wing. It extends down under her skin a bit more. I'm going to attach a picture at the end, and it is a bit gross, so be careful.
Anyways, she hasn't shown any signs of pain, and when I dab the wound with a warm cloth she doesn't even react much. I'm worried it might get or already have frostbite. I put some Neosporin on after cleaning it off with warm water and drying it, and we're soon getting rid of our rooster. I'm assuming he roughed her up.
Blue, (that's her name), has been eating and drinking normally, but I haven't seen her poop today. I'll post an update if I see anything strange.
Their coop is store bought, meant for 8 chickens, and I use pine shavings as bedding. As for treatment, I would like to be able to solve this myself.

 

[bpoore04]

I’m very sorry that this happened. I don’t know much of what to do for an injured chicken but I hope yours gets better. Hopefully more experienced people will chime in.

 

[Wezdin]

Sorry to hear about blue. The first thing i would to is to get the wound clean. I would recommend sterile saline. If this isn't available you can use Peroxide but i wouldn't use it more than once because it kills everything on the wound, good and bad. From what i see the wound might be a slice that pulled open.

 

[Wezdin]

Also, how long are your roosters spurs? that could be the source of the wound, He might have accidentally hurt her.

 

[KirBear]

He actually doesn't have spurs yet. I can see them growing in, but nothing sharp. He mounts her pretty aggressively, and then our other rooster holds her down and bites her. We're selling one too see if it helps.

 

[Wezdin]

He actually doesn't have spurs yet. I can see them growing in, but nothing sharp. He mounts her pretty aggressively, and then our other rooster holds her down and bites her. We're selling one too see if it helps.

That sounds more like being attacked if 2 roosters are in on it, i would def rehome one, even if it is freezer camp.

 

[KirBear]

I believe it's mounting, because it goes both ways, one rooster mounts and the other holds down. But I'm not sure. How can you tell the difference?

 

[twendt]

Clean the wound now, infection can set in fast, the wound looks a bit old to me, some areas are already scabbing over. It's best to irrigate with Sterile Normal Saline, you can find it at Walgreens or any major pharmacy. Then put on Triple antibiotic ointment and keep covered with gauze and Vet Wrap ( horse wrap/ flex bandage). You need to separate her for a while.

 

[Wezdin]

I believe it's mounting, because it goes both ways, one rooster mounts and the other holds down. But I'm not sure. How can you tell the difference?

I'm no expert on this subject, but from everything I've seen only one rooster ever participates, not 2 of them working together, and I have multiple roosters.
Sorry if this is coming off mean, I don't mean to fight and I'm getting off the subject at hand, helping your hen.

 

[KirBear]

How do you use a wrap on a hen? Do you wrap it around the body? I also don't currently have Saline, if I were to get some tomorrow would it be okay? I washed it well and put on Neosporin.