a month or two back i posted about how 2 of my chickens had a bald patch on the side of their necks. they all got treated for lice and mites so i then presumed it was the rooster(where he was hanging on their backs with his beak perhaps). but since then the rooster has also developed this small bald patch on the side of his neck, and another hen also. also the rest of the roosters long neck feather seem thin and patchy(not their fluffy colourful usual self!) so i thought maybe moulting? but its gone on for a few months now with just feather loss on a small patch on the side of various chickens necks. no new feathers have grown back. and people are starting to ask whats wrong with my chickens? they are worried it may be contagious (out of 50+ only 4 or 5 have this problem..but still maybe its something slow spreading?) any ideas people. im at my wits end!!!