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The Heal spell is supposed to harm undead as far as I know. I used a Healing Kit on a mummy in Barams' hideout and the console reported that I had "healed x points" on the mummy.

Does this mean that Heal Kits actually decrease damage on undead, or was this actually damage on the mummy that was simply incorrectly reported as healing in the console?

That was a +10 Heal Kit too :)
This question / problem has been solved by PeterScottimage
Healing spells are Positive Energy magic, that damages negative energy creatures: Undead.

Healing kits are NOT Positive Energy magic. They are standard first aid kits. Bandages, splints, thread for sewing wounds closed. You can still patch up undead with first aid.