“Healing magic isn’t clean. Not by a long shot. Magic is messy and unpredictable, despite being (technically) a science. When you heal someone, you aren’t putting your hands on them and saying the magic words and they’re all better. You’re taking the two ragged ends of the wound and convincing the person’s body to accept them. Or cauterizing an injury with your bare hands. Or just telling death to fuck off. It sucks.”
“Healing magic is brutal, traumatizing, and dangerous, for both parties involved. It’s like performing surgery, but your tools are all rigged with sensitive magical explosives that can go off partway through the operation. Have you ever tried to negotiate with an infection? Hearing their rasping, sickly voices, the smell of disease in your nose… it’s enough to drive anyone to madness. I once saw guy break a leg while he was with a plant mage; the bone was just hanging out. The crazy fucker cut the damn thing off and shoved a sapling in the wound. Pete needs to prune his legs now.”
“Does a damn fucking good job though.”
TL;DR: healers are less this:
And more this...
Crossed with this...
And a lot more blood