Cauterize

The piece of iron in your hand burns bright red as a ray of fiery energy jumps to a creature of your choice within range.  The creature's wounds seal painfully and it regains hit points equal to 2d4  + your spell casting modifier.

The creature must make a DC 12 Constitution Saving Throw.  On a failed save, the creature has disadvantage on its next attack.

At Higher Levels.  When you cast this spell with a spell slot of 2nd level of higher, the healing is increased by 1d4 for every slot level above 1st.