I hope u can tell something from these pics they arent very good, but the skin is kind of reddish in the bare areas, not really fire red but its definately discolored. It seems to almost always start on the left half of their neck and works its way around to the back of their head. I noticed some production hens at our local county fair that had close to the same thing. I was surprise that they would bring them honestly i thought it was a little irresponsible if its possibly contagious. However, the judge made to comment to them so maybe its nothing. I did wonder if it was parasite like mites or lice but i havent seen any on them. Then again I dont know how hard it is to see them.