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The reason humans get numbed up when they get operated on is because pain makes them crazy. Chickens feel pain, but they do not go crazy with it as we do. They handle it with what seems to be grace.

Australia is currently free of the main contagious avian diseases such as Newcastle and avian influenza, so I would lean toward this being a squamous cancer as @Eggcessive mentioned. It's generally slow growing, but will eventually metastasize.

What is your location? That can affect what disease this might be.