rooster with battered knees

I have a wyandot rooster whose knees seem to be battered to heck and back. It kind looks like when you fall down on gravel, but it was all broken glass.... Sort of like the face of a muscovy duck, but on his knees. I took a close look at them a while back and though maybe he was just fighting and got the losing end of it (no blood), but it's been a while and they don't seem to have "healed".

Sorry, no pics right now, but I think the explanation might be enough...

Is this a common thing with the breed?
Is it something I need to be concerned about?

 

I couldn't get him to hold still and it's too hot to chase him around...


It seems to only be on the front of the knee (inside the bend), but on both legs.