Even if we go that direction with the whole "Restores to health but also on the very edge of death" thing it can create (quite viable, but that's mainly because HP is weird in general), that *does* mean that any enemy you come across better not have any cosmetic scars ;)
Given that scars have an actual in game affect, that villain with the cool scar through their eye is now seriously in trouble if you manage to get the spell off.