At the very least, tell her to get sensitive masks that are latex free. Her employer must supply them. It sounds like contact dermatitis which is developed over time. It starts out as little bumps and blisters on the bottom part of the face and can develop into a nasty painful rash. I have dealt with several cases that even most physicians misdiagnose. It can happen with latex gloves as well and can be quite debilitating. Sometimes the powdered latex gloves can cause problems not only with hands, but can also be spread to the face - especially the nose. When the skin becomes broken because of the irritation, then staph can set in. If her skin is not too broken, tell her to try a little Benadryl gel to calm the inflammation - but change to different masks!