What role does your epidermis play regarding the immune system?
Think of it as a wall, and behind it are the defenders (white blood cells). This is somewhat simplistic, but its the basic idea. Your epidermis is there to keep most things out, so you could even take the metaphor as far as to say that anything sharp enough to break it is like a battering ram for germs. Since all the skin on the outside is dead, germs cannot attack it the way they attack the rest of your body. They have to find a way in first, which they are doing all the time, but they’d have a much easier job of it if it weren’t for your epidermis.
