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That is quick, so I would not think necrosis. Maybe just bruise from eating like you suggested, or caused by an over zealous pen mate that wanted what she had.

Looks like potential beak necrosis. My understanding is that feed could build up in the beak and cause rot, or an injury could cause it. Did it just appear, or do you think it could have happened over time? I'm sure a vet may have suggestions to help stop it from progressing. Best of luck to...