My mother's the same with my dad. She used to be with me, but knows better these days. My dad gives in eventually and puts up with stupid amounts of pain; I've no idea why.

I think you should suggest a new compromise, like pulling one hair out of her head for every pimple she pops. That seems reasonable to me. Or you could smash one of her kneecaps in with a hammer for every pimple she pops. But that might get complicated after two pops.