Your right, it is early stages, you might get away without having to cut out that dark spot. Give antibiotic, I think Tylan orally, or shot in breast. Put a drawing agent Like, Ichtamal on it. Gauze pad, then wrap foot in, vet wrap...its sold in most farm stores. It comes in rolls about 3 inches wide, stretches and sticks to itself so you don't need to use tape. Keep him isolated on a softer flooring. I have mine in a small coop with lots of shavings. If after a couple of days they don't go down, you will probably have to go diggin in it. They usually open up fairly easily, that one that is in the last photo, Then there might be pus like gunk inside you need to squeeze out & possible pull out a "plug like" thing, that is the root. Hopefully, you catch it early and don't have to operate. I'm going to uncover my goose foot today & hope its better. I don't want to go digging. PS if you do go digging, wear gloves, its a staff germ, you don't want to get it on you.