Fortunately my little girl hasn't had any other issues. I initially thought it could be bumblefoot but didn't find any examples that looked like it. So I've just been cleaning and watching.
But I'm sorry to hear about your chicken and her/his tumor.
Yeah it's so bizarre I've been trying to do research on it but it's hard to describe and google haha.
But your response makes me feel better. Hopefully it's nothing I plan to keep an eye on it though.
I noticed mild bumblefoot on my 1 yr old Ameraucana and started treating it and it's now almost healed.
While initially soaking her I noticed she has a very odd looking growth/formation on her other foot. I don't think it's bumblefoot and doesn't appear to be a sore or infection. Her footpad...