Sore on foot : duck

[Shadowthorn]

Hello everyone

One of our Cayuga ducks developed this sore on the bottom of their one foot and it doesn't seem like bumble foot but I was wondering what your thoughts would be on what this is?

Thank you in advance

 

[RossAcres]

I had this issue with my call duck when I rescued her. We determined it was a callous or maybe a wart of some kind. I cut off as much as possible, spray with antibacterial liquid, and wrap. It usually comes from rough ground or cage wire.