Your fey heritage grants you increased healing but leaves you vulnerable to cold iron.
Prerequisites
Benefit
Whenever you receive magical healing, you heal an additional 2 hit points per die rolled. Unfortunately, you also suffer +1 point of damage from cold iron weapons (although you can wield cold iron weapons without significant discomfort).
Special
Healing effects not expressed in dice heal an additional 2 hit points per effective level of the spell or effect. So, a 3rd-level effect would heal 6 additional hit points.
Effects that have neither dice nor an effective level provide exactly 2 additional hit points of healing.
The benefits of this feat do not apply to fast healing or regeneration abilities, even if they are magical in nature.