I see.
I might make it the other way round though - the knife makes deeper cuts, and the scalpel, being smaller and more precise will make shallower cuts.
Oh, wait... that's actually a good idea. However, there is one problem with the logic of this. Scalpels tend to be much, MUCH sharper than knives, because knives are meant to cut stuff like meat, and scalpels are meant to cut flesh, and human flesh is tougher than many types of animal meat and/or skin, so scalpels would need to be sharp.