We had a lovely hen that didn't start re-laying this spring when her friends did. We noticed icky poop covering her backside and realized she was egg bound. Did the baths, mineral oil, calcium, ect. She couldn't lay the egg. Upon further inspection- encircling her entire vent was black- like the skin had dies, or gotten cancer or? We couldn't pull it off- as it was growing on her. It had enclosed her vent enough that she would never be able to lay- even if we had gotten that egg out of her. Has anyone else heard of this?