It is bad to lightly scrub my ( face ) with a [ pumice stone ]?

Use 2% salicylic acid face wash and 10% benzoyl peroxide vanishing cream by clearasil. Then apply Beauty Lotion to your face. It's the generic version of Oil of Olay. Do this routine twice a day. It will get rid of the grimy and gritty feeling. You're tiring out your skin. Don't use a pumice stone on your face. In reality, we're not supposed to use scrubs on our face. It makes tiny tears in our skin. Hope I helped :)