My almost 2 year old chicken, Parm, has a case of dried up poop, but under her vent. All in her feathers and stinks real bad. Her vent is clear, she eats and drinks normally. I give her ACV in her water occasionally, give her yogurt once a week. What else can I do Washed her up twice already, once outside once inside which was a trick to get her past my dog. Not sure about eggs because I have 3 hens and since they lay sporadically, I average 2 eggs a day so far. Parm always had a bald head too, and the bottom of the pecking order. No bugs.