I've noticed recently that Basil's neck feathers are coming out. It started off with the feathers looking a bit 'greasy' which I once read was a symptom of northern fowl mite - I think? Now he is going balder by the day and the skin underneath looks a bit yellowish and flakey/crusty. It's also like this around his vent area, but he has always had bad skin. I did have the same sort of thing around the head with another chicken who died a year or so ago (not necessarily from this problem). I have inspected him and can't see any crawlies (although I've never seen any so not entirely sure what they look like in real life) and I've also applied vaseline and aloe vera gel (not at the same time) to both ends to try and heal it over but it doesn't seem to have helped. Yesterday I noticed one of his girls was pecking at his neck and he was quite submissive, so am wondering now if it's hen-pecking and whether I should get anti-peck spray, or whether she is grooming him and pecking at some sort of mite? He's quite old (well at least 5 years old) but I've never seen the girls (who are much younger) peck him before. Any ideas on what it might be (simple moulting? he's never moulted before though) and how I can help him as it is getting worse and with the pecking it's starting to get a bit raw? Poor Basil - he's normally very majestic looking but often looks a bit dejected now, which could of course also be due to his age and the weather.