We have ewe lamb that started losing the wool in an odd pattern over her back 12" x 2" and one smaller patch. We had taken her to an LAI clinic about two weeks prior to her wool loss. It looked like the wool just fell out. No red, no crusty, no raised spots, just plain normal looking skin. I sprayed her back with the generic version of Enviro-Sep ($1.60 per can) two times and after about a week her wool started to grow back in. The new wool is black. My understanding is that if the wool grows back in black, it was wool fungus. By the way, I didn't scrape the skin, just used the spray.