We do not have a rooster. I can not see any creepy crawlies or eggs on them. I've not seen the hens pecking at each other, but that doesn't mean that they aren't doing it while I'm not watching.
Feathers are missing at the base of the tail feathers and around the vent. I have 9 hens in my backyard flock. They are about one year old. Back in November (nearly 5 months ago) One of my girls, "Chicken Miss Nugget", started losing feathers around her vent and the base of her tail feathers...