Welcome to Just Answer and thanks for your question. When someone is having any surgical procedure, the anesthsiologist, nurses, and doctors need to assess the color of the person's skin, not their makeup. The fewer extra chemicals in an OR, the less likely anyone is to have a reaction, and the less likelihood that a chemical will combine with something else in the OR and cause personnel to have a reaction. For the same reason, you should not wear perfume.
No. I think you should go in with a clean face. They won't be looking at your face anyway other than to assess your well-being.