This may hurt a lot
Charlie is an exceptional surgeon, and is able to operate in a pinch without any of the standard facilities. As long as he has some basic surgical tools, he can miraculously stitch together even the most severe wounds, although doing so is quite taxing on himself, and the pain of operating without anesthesia is often quite traumatic for the patient.
Exert your Mind and spend 15 Minutes treating a specific Injury on a Living target. Roll Dexterity + Medicine10 - 4. Each Success reduces the Injury's Severity by one. If you can reduce its Severity to zero, the wound is fully healed. Otherwise, it is partially healed and fully, Properly Stabilized. It will heal the rest of the way at its natural rate. Difficulty
You cannot target yourself, and you cannot target the same Injury more than once.