My cat Honeybun gets kitty acne. I've been doing the warm washcloth stuff on him, and peroxide as well. He acts like I'm torturing him with just a washcloth and has remarkable strength for an old guy. He's FIV+ as well, so I think it's hard for him to fight off many things cats can get.

I'd definitely get my kitties to the vet if they're all scratching and pulling out fur. Sounds like stress and/or allergies to me. Vet appts. may be $$ at times, but to keep the kitties healthy, it's the best bet!