Acid damage not healed by cure spells?

[Halaster Blackcloak]

I swear, sometimes I just lose all sense of where or when a rule is listed, or even whether or not it's an "official" rule. Isn't there some source (I thought it was in the 1E DMG) that says damage done by acid cannot be healed via heal or cure spells, but needs a regeneration spell? I can't for the life of me find where I read that, and I'm not having luck finding it. I remember having used that rule for ages as when I first read it I thought it made acid damage all the more horrifying - you may heal hit points of damage done by it, but you're left scarred and disfigured until you can regenerate the flesh via a regeneration spell.

Anyone remember where precisely this is written?

[slade88green]

PHB says acid damage can not be healed by regeneration. It can be healed normally. PG 100 under grenade like missiles.

[Halaster Blackcloak]

You know, now that I think about it, that makes no sense. Acid damage literally destroys tissue, so the scarring is extensive. It makes sense that curing or even heal spells won't "fix" it as those stores mainly restore health and hit points, whereas regeneration will regenerate new tissue, much like it would grow a new arm. Seems to me that regeneration would be the only spell that fixes acid damage. Hmmm.

[Tawnos76]

That is what I always that of it as well. Regeneration should be allowed and none of the other.