Our barred rock has recently started acquiring some bald spots on her head. Opinions on what's happening? We don't have any roosters. Our ladies are approximately 9 months old. The spots do not have any open wounds, nor does her skin seem irritated at all. I have checked the best I could for mites and haven't seen any signs. If she's molting, there should be new feather shafts, right? Her behavior is normal. It has been super cold and blustery this week (you can even see a tiny bit of frostbite on her comb from a storm last month), and they have been choosing to stay in the coop most of the day- so I am thinking they are just bored and picking at one another... But wanted to make sure I wasn't missing something. Any opinions or advice is appreciated.