I am not understanding. Do you want something to CAUSE numbness? Do you want something FOR numbness you already have and want to lose?
You can't take Lidocaine internally. Do you have a place on your skin which you want to numb, or do you want emotional numbness? I really don't know what you are refferring to.
I think what he's saying is that he wants his face to be numb ('cuz he's getting in a fight with somebody or something)... In that case, just smoke yourself a big crack rock; might as well start now since you're already violent...then you can move on to breaking into houses and robbing liquor stores!