A little over a month ago I noticed that my one year old rooster's toenail was dull and short. I figured he had just broken the claw and that it would grow back. However, looking at it today, it's still short, brown, not growing, and accompanied by swollen tissue. Next to the healthy toe for comparison It doesn't seem to be causing him any pain, and the scales on his legs look fine. Is this due to injury, fungi, or mites? Thanks in advance!