Medistatin is an anti-fungal. These meds need no egg withdrawal. Amoxicillin is a common broad spectrum antibiotic and is safe to use on humans, ducks, chickens, dogs, cats, fish, alligators, well, just about anything that lives and breathes. It will require an egg withdrawal period following...
Cheers for the progress! Good work!
I'll stick my neck out and offer the possibility of a bacterial infection in her lower reproductive tract. It's likely with the proximity of all that necrotic tissue hanging around her vent. I suggest an oral antibiotic to get on top of this. Yeast may also...
I'm very familiar with skin cancers, since I've had every single flavor they come in. Also, I had a hen with a squamous cancer on her tail. You don't need a biopsy to tell if a sore is a cancer. Cancers won't heal in spite of all you can do to treat it.
@Isaac 0 needs to weigh in on this. There's a remote chance this is a squamous cancer. But soaking in warm Epsom salt water with a squirt of Betadine in it is definitely called for.
We all can imagine the pain of removing scabs on such a tender area, so hopefully, any necrotic tissue will soak...