I was doing a wellness check on my ladies and as I was checking on one there was an awful smell, so I checked her over and found this!!!! I have and had no idea..... PLEASE HELP, you can see inside her chest cavity.
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Omg that's horrific. It doesn't look survivable.Looks like a Breast Blister.
I'd try cleaning it out and go from there.
https://www.backyardchickens.com/threads/bumble-breast-breast-blister-graphic-pictures.1096276/
I did clean it and try to help her but in the end I had to cull...How is your chicken doing? Did you clean it out with Betadine? Did you determine if the hole is not in the crop?