Creating a latex style face mask?

Hi, I've bought various face masks but they're never the right shape I need for the characters I'm trying to replicate and don't offer any morphs or options to change them. For an eye mask I just took the fitted mask and altered it in Blender, imported it back etc. That worked out okay. But the one I need now covers part of the model's cheeks as well so having a static obj doesn't allow for the movement involved in facial expressions. Is there any way I can maybe shape a head geoshell to be the shape of the mask I want or is there another better way of creating a particular shaped face mask that can have its own surface?
Thanks,
Comments
Hi, Just fitted the obj to the face and it moves with the expressions so no problems!