Cauterize

The pure form of fire heals, but only those who can master the pure form of fire can do so consistently. You place your hands on a wound and evoke fire. When you cast cauterize, it must succeed on a Constitution saving throw to receive 1d4 healing. If they fail, they take the same amount as fire damage. 

This spell's die type increases by 1d4 when you reach 5th level (2d4), 11th level (3d4), and 17th level (4d4).