How does the healing jutsu work? In Naruto, when the medical team starts to heal wounds, they use their chakra. Does this only heal and restore chakra, or does it also help regenerate the skin cut by kunais?
Medical ninjutsu can be used to heal wounds, such as those cause by kunai. It is used for a number of purposes, including:


Healing: Healing Chakra Transmission, Healing Resuscitation Regeneration Technique
Treating internal and external injuries: Mystical Palm Technique
Treating poisons: Delicate Illness Extraction Technique
Performing autopsy or surgery: Chakra Scalpel
Healing oneself: Creation Rebirth, Strength of a Hundred Technique
Offensively in several ways: Body
Pathway
Derangement,
Poison Mist Needle
Shot.