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She may have pecked it off herself if it was annoying her, but there is a strong possibilty that someone else is pecking at her and caused the injury to begin with... If you have blu-kote I would spray it on there and also keep a close eye out for the perpetrator(s) as bullying/pecking can get...

Can you give her a soak in a warm bath (with epsom salt if you have it) and see what comes off? It looks like some or all of it might just be dried poop... I'm not sure if an injury could cause soft swelling like that... It doesn't look infected and chicken pus is solid so it would be firmer...