I posted before with no responses. So I am hoping someone has an idea what this might be. It is a firm, fast growing growth. No other symptoms and she seems to feel fine.
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I would say it is a cancer tumour..Sorry, but I can almost bet money that is what it is!?
Also...Chickens are the best at hiding disease or illness until they are really sick...
Good luck
I can't really tell from the photo, but could this be something that resulted from an injury to the lower part of her beak?
I am sorry for your troubles.
MrsB