On another thread, I got several answers responding that this was indeed bumblefoot. I've yet to do any treatment, but I'm going to keep an eye on it at least until next week.
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From what I understand it's a staph infection that enters the foot pad via any injury or open spot. Since they spend so much time on their feet and jumping on and off roosts and digging, scratching and foraging they are bound to get some sort of spot for infection to enter and take...