Magda Luckbender
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I wish to suggest an unpleasant but cheaper option.
He could get a surgeon and friendly level 1 cleric handy with multiple Cure Light Wounds and also Infernal Healing. Take knock-out drugs to go unconscious (a lot of booze would do it, but something stronger would be better). Activate Infernal Healing,and keep it going for the surgery. Then the surgeon cuts away the permanently acid damaged flesh, right down to the bone. More magical healing, keeping him from dying. Heal to full.
I imagine the acid-damaged areas would grow back without the acid damage. Subject to GM interpretation.