I think I will take him into the vet's to do this, less stress all the way around, except for Bo. he's actually pretty good at the vet's though.

Logan, it's not a skin preoblem really, they think it is more of an obsessive grooming thing. Maybe the urine test will give more insight, I had a weird skin case with my RB kitty Boo. he started pulling the hair over his back and hips out, I'd find clumps of it on the floor. I had him tested for all sorts of stuff, all came up negative. The vet told me it could be from stress, and the hair he pulled out never grew back.