I'm not sure where this should go as it's not really an injury and it isn't really flock management either but could have been related to either in the past. I brought home a lovely little (ok, maybe not quite so little as she is now the largest chicken I own at 2560g) blue orpington pullet this weekend from the Crossroads show in Indiana. This evening, when I brought her in the house to get her weight and deworm her I noticed that she has a hole in the webbing between her toes. Four holes, actually, one between each toe. I was wondering if this was from something like a toe tag for identification or if it could be a natural "defect."
Here is a picture of the foot with the largest holes. The other foot has holes in the same locations, just slightly smaller (I do have a picture of that one too if it would be helpful, I just haven't uploaded it)

Here is a picture of the foot with the largest holes. The other foot has holes in the same locations, just slightly smaller (I do have a picture of that one too if it would be helpful, I just haven't uploaded it)