I have 4 brown leghorns and 2 americaunas. All 6 have large bald areas above and below their vents. The skin is bright red and looks sore. I sit and watch them and they seem to peck at themselves as if itching. This has been getting worse and worse over the last 2 months. They still eat and drink well and give me an egg every day. I use shredded pine for their bedding and nests. At first I thought it was mites. I have cleaned the coop twice really really thoroughly and put sevin dust in all the cracks and the bedding. Even put it in the run area. I completely dusted the birds. But its not getting any better. I check them several times a day and at night with a flashlight and NEVER see any sign of lice or mites. But something is going on with them. Finally went to the vet and he said to put sulpher lime dip on them. But then we cant eat the eggs.....but for how long??? If lice/mites drown why not just bathe them in water?? I'm scared to put them in the lime dip. He also said to switch to shredded paper in the coop for awhile. Is there a problem using pine shavings??? I am so confused on this stuff and my girls look sore.