I have an Isa Brown hen (2 years old) who has had a bald patch (no feathers) on her breast and neck for the past 8 months or so. I thought it was a molt, but its been too long now. The skin is bright red where the bald patch is. She is not laying many eggs, and I believe that most of the eggs she lays, she has been eating. I've tried spraying the bald patches with an antibiotic spray (cant remember the name but got it at TSC), and I've supplements oyster shell in their food to try to stop egg eating. Can anyone please shed some light as to what may have caused or be causing this, or what I can do to help her? I've researched on the internet but haven't been able to pinpoint anything in particular. Thank you in advance!