I sorta noticed that my hen was sitting more....and she was up on a shelf in the barn and clucking at me....I was down by the boxes and looked up and her 2 toes were swollen...it looked like she had a stone that went straight through her toe because you could see it on the top and bottom, on one...
If this is a very beloved chicken, I would take it to the vet for some Rx antibiotics topically at least. If you want to be absolutely sure and you can afford it, I would go to the vet for this.
Im not sure about mine, 1 day post op, the feel dont look good, but she had some extensive ribboning...