Blood spots in the coop

[Illramu]

Upon cleaning my coop this morning I found several blood spots under the roosting bar. I'm not sure which chicken it is. I've looked them all the way over. No blood spots, no scars, nothing.
It looks like it is in the front from the droppings behind it. I'm at a loss. Any ideas?
Thank you!

 

[Firekin1]

If you see nothing anywhere then chances are someone broke a blood feather, if you keep seeing it then I'd suggest looking through feathers for it, when it happens here they tend to be in the neck area.