Skin Healers are Silver healers who can heal anyone but themselves. Some are also strong enough to heal a corpse to look like someone else.
"Skin Healers are perceptors, considered the counterpart to blood healers. They cannot heal themselves, but they can heal other humans through touch. As with blood healers, skin healers require immense amounts of training, similar to Red physicians. Though their abilities are incredibly valuable, the most talented skin healers are usually apprenticed to noble and royal families, serving the rich and powerful. In war, skin healers are usually reserved for Silver legions and battalions." - On Silverblooded Abilities by Victoria Aveyard