Epidermidis is pretty harmless, except for people with implanted devices like catheters; since epi likes "surfaces" it tends to colonize the surface of catheters.Most people have either epi or aureus, but not both,and these two bugs are a small part of the total skin microflora.In general, having S aureus on your skin or in your nose does not seem to be harmful; however, if you have a cut, and aur