In my flock of pastured hens, I have a white leghorn with a bump on her ankle that I just noticed a few days ago. If it was on her foot, I'd assume bumble foot, but this is well above the area you'd usually see a bumblefoot bump. She does not appear to have any discomfort, limp, or any other abnormality, literally just the bump. This is in a flock of ~50 chickens that have unrestricted access to pasture, woods, and it's an old farm, so she really could have gotten into anything. I'm trying not to catch and stress her out unless I need to, she's one of my friendlier girls but still doesn't want to be grabbed.