Hands of a Healer( Book of Exalted Deeds, p. 43)
You can heal more damage than normal by laying on hands.
CHA 13, lay on hands class ability,
When determining how many hit points you can cure, treat your Charisma score as if it were 2 points higher. For example, a 7th-level paladin with a 16 Charisma could cure up to 28 points of damage per day with this feat.