Thanks!
Please do try to remain optimistic. Keep us posted on how they are doing.
If you can't get a fecal float and still think treating for worms and/or Coccidiosis would be beneficial, let us know. You can get medications at most feed stores.
Looks like a normal lesion/peck wound to me. I have had this with roosters, they get a small cut or scrape, then as it scabs over they stand there and let the hens pick at it making it worse :hmm I would try Nu Stock or Pine Tar - either of those are supposed to taste bad and deter picking...
I agree, I would send one for necropsy if possible. Call your state lab if you lose another, they will instruct you on how to ship the body - often they have a label you can print.
https://www.metzerfarms.com/PoultryLabs.cfm
Getting a fecal float is a good idea if there's a way to have...