One of my Silkies has the same bald pattern on top of her little head. She's a very small bird and I have 2 Silkie roosters - therein lies the problem, I am sure. But she has lost the 'thickness' of her fluff on her tail and her back also. I am going to work on this problem this weekend and try to fence off an area where the hens can take a break for a couple of weeks and see if they start fluffing back out again. I don't suspect mites, but it could be. If fencing them off for a couple of weeks does not help, then I will try some poultry dust on them. I said I would NEVER use poultry dust because I'm afraid it cause residue to get inside the eggs I sell. I don't use anything that could taint the eggs. So, I'm probably just going to use the DE, as I wouldn't sell my eggs if I used the poultry dust. It has permethrin in it, but I read somewhere that permethrin is synthetic and stronger than pyrethrin, which is a natural bug killer, but I can't find anything at all with pyrethrin in it. Does anybody know the name of a product that contains the pyrethrin?