Three of my hens have this on their necks and so far, I have bathed them with baby shampoo, used Garden & Poultry Dust, DE in the coop, too and finally, in case it is pecking, used PICK-NO-MORE Cover Up Lotion which stinks. I have them now on Feather Fixer, also. These patches are getting larger. What am I doing wrong or what do I need to do? Someone please help! Here is a picture of my Elvira, poor thing. She has stopped laying as of 2 weeks now. I really hope someone can advise me . . .