Hi Fizzybelle. I've had the same thing happen with a peacock. There was blood involved as well! The skin flap was lifted right up. All healed well, in about a week. Cheers.
Thank you Coram, that's good to know. I did file the bump down a bit and then dabbed sani-chick (a poultry disinfectant, basically iodine) on her beak, and a small boo boo she had on her cheek. She's been fine.
Also, if anyone needs to file a chicken beak, I recommend Scholl's electronic nail file. It's battery powered, doesn't cause heat from friction, and makes the job a little easier. The tapered changeable heads help with odd angles too. I'm sure you could do their nails too if you wanted to, lol.