SRD:Inflict Minor Wounds
From D&D Wiki
|This material is published under the OGL|
|Casting time:||1 standard action|
|Saving Throw:||Will half|
When laying your hand upon a creature, you channel negative energy that deals 1 point of damage. A Will save negates the damage.
Since undead are powered by negative energy, this spell cures such a creature of a like amount of damage, rather than harming it.