What happened and how can I fix this?

[Goose08]

My almost 3 year old BBW tom, Goose, has started limping and spending a lot of time in his pen with his bonded BBB hen. All my poultry are free range, and he usually spends time around the property or with my Blue slate tom. I checked out his foot today and it looks like the middle and scales are lifting. What caused this and how can I help? It’s also pretty swollen. Anything helps thank you so much.