This is a different bird. That bird from last month ended up passing away shortly after. On that thread, I posted the response from the poultry vet on the likely cause. That looked like internal tumors or something in her reproductive/vent area. She didn't present this hard, black, dry... Necrosis?I helped with your previous thread last month. It could be a melanoma inside the beak, but would need to be confirmed with a necropsy and histology by your state vet pathologist. I would go back to your previous thread to post this, or make a new thread.
But this seems like an altogether different thing...