Have you ever been to the doctor with a sore limb and they send you for x-rays and you get zapped at every angle this side of getting stood on your head? That's what we need you to do with his foot.
Photograph his left foot from the top with toes flat and spread. Then do it from the bottom, with his toes spread so we can see clearly the webbed tissue between the toes. We need to see as much of that left foot as possible.
I have a hunch, from the way he lifts the foot and pecks at the toes, that he's badly bruised the base of one or more toes. You will likely see greenish discoloration. I had a young hen fly feet first into the window of the run when some marauding dogs attacked my flock this past winter. At the time, I couldn't see any injuries.
After a day or so, she was limping badly, and standing with the foot held close to her belly. That's when I looked closely and saw the greenish bruising between her toes. It took two weeks of aspirin twice a day, and she was healed.
I let her stay with the flock as she was self limiting her activity, and to be honest, her being temporarily crippled gave the flock a respite from her wicked, naughty, bullying.
