He could of got this when he was younger. Thus explaining why it doesn't hurt and why there is no blood or inflamations. It could be a deformed feather or a spike of some creature or object and just wouldn't fall out and then when the chicken grew older the skin formed around it?
HOLLY POTATO! Owch. :eek:
Does it seem to hurt the roo?
Also when and where did you get the rooster? Rescue, the road, random place, or from a cruel past owner?
Edit: When did you notice this?