By all means, keep using infernal healing! It's perfectly safe.
Pay no attention to the fact that casting it requires evil components, that one radiates evil while under its effect, or that it won't heal damage caused by weapons that we devils are succeptable to. That's all just meaningless window-dressing. Giving this spell to mortals has nothing to do with damning the souls of the corruptible.
You can trust me. I'm lawful. I would never lie to you!