Skin is the border of our body and, as such, it is that through which we relate to others but also what separates us from them. Through skin, we speak: when we display it, when we tan it, when we tattoo it, or when we mute it by covering it with clothes. Skin exhibits social relationships, displays power and the effects of power, explains many things about who we are, how others perceive us and how we exist in the world. And when it gets sick,...