Hello, I have one chicken in a flock of 33 that has missing neck feathers. I read in a few other threads that the culprit could be pecking (boredom/aggression), lice/mites, or molting. With this photo can anyone tell which it is? She's a golden comet, and they free-range all day. We feed them Blue Seal organic layer pellets. She's almost a year old. The others all seem fine. We did have a lice issue with at least one a few weeks ago and used permethrin dust on all the chicks, their bath areas, and the coop. Any advice is appreciated. Thank you.