Hi I have a question. I have never seen this before my one ferret started with it shortly after we adopted him. I don't believe in bathing them all the time due to the stripping of their natural oils. I have a neutered male about 4yo who has this waxy buildup on his head and neck. I do bathe him to get it off because he has that sour waxy smell but within a week it starts to build up again and within two weeks you could literally scrape small chunks off with your nails off the top of his head and if you don't keep it off he gets red underneath. What caues this? and is there a solution to helping him to stay cleaner? Thank you Debbie [Posted in FML issue 5008]