what is that bump from???

[kaylanoto]

 

[Eggcessive]

It may be an injury from a cut or scrape on sharp object such as a feeder, fencing, but it also could be a papilloma caused by a virus. Sometimes these growths fall off after a period of time. Here are some similar cases to read about in post 5 of this link: https://www.backyardchickens.com/t/905053/10-wk-old-ba-cockrel-with-bump-on-beak-normal