Many (Not all) of my hens have these patches of no feathers. The pictures are not great but they give you an idea of where the affected areas are. It seems to be on their backs (I think from mating??), under their beaks (only on 2) and on the backs of their heads. I'm a first time chicken mom...I've had them for about a year. Any suggestions and feedback is appreciated. Some more details- Hens are a year old. I have 10 hens, 1 rooster. They are in the coop and attached run 24/7 with access to both. (But they don't free range). They are on a 16% Protein Layer Crumble and get a cup or two of BOSS every day, along with table scraps and such. Buffs, Sex Link, Barred Rock, RIR, EE, and my rooster is a Buff Orpington too. I have noticed varying instances of this since about December. Thanks!! Let me know suggestions of what to do and how to help them.