The second benefit of the Healer feat (PHB, p. 167) gives me the following action:
- As an action, you can spend one use of a healer’s kit to tend to a creature and restore 1d6 + 4 hit points to it, plus additional hit points equal to the creature’s maximum number of Hit Dice. The creature can’t regain hit points from this feat again until it finishes a short or long rest.
Can I use this ability to heal myself?