Hi, For the past 6 months my bluebell hen Betty has been bald on her neck/ears and also has a bald area around her vent which looks quite sore. She is eating normally and laying extremely well. I've tried a variety of things, none of which seem to be working. - Initially I tried DE powder twice per week. - After that, I applied Beaphar Anti-Parasite Spot-on twice within the designated application times. - After that I've tried Harkers Ivermectin (the one for pigeons). I've washed her vent area and tried to keep it clean, as she did have a build up of poo. As i've suspected feather plucking I have also been spraying her bum and neck (carefully) every night with Nettex anti-pecking spray. She has some pin feathers coming through in both areas, but the skin on her neck looks quite flaky and sometimes red. I have three chickens in total and the other two are showing no symptoms. (One of my other hens is plucking feathers from her sister's back, but that is being controlled with the anti-pecking spray). I feel awful for Betty, she looks a mess! They are also booked in to chicken boarding next week while we are on holiday, and I'm worried that the lady won't accept her as she looks like something from an RSPCA advert! Any other thoughts on what it could be causing the feather loss? There are absolutely no signs of mites or lice on her, unless they are under her skin and so invisible to the naked eye.