Heal Bite

Through biting and consuming the user's chakra, they can heal the injuries of others, as well as themselves.

Overview
This ability has been shown to heal even life threatening injuries, and is also capable of quickly restoring the stamina of those healed. This technique, however, rapidly depletes the user's own chakra reserves, and leaves them with a permanent bite mark every time one uses it. Due to its depletion of chakra, it is dangerous for one to use this ability too regularly as Karin normally refrains from doing so more than once a day.

Trivia

 * Apparently, over time the bite marks disappear. This was seen by Karin in Boruto: Naruto Next Generations when Karin's wrists and forearms showed no marks unlike years before.