I believe that we can only heal ourselves (self healing) or by God healing us and here is why, we all have the natural ability to heal ourselves, i.e. White blood cells, but do you think you could have a white blood transplant and heal somebody else? Hell no, you have different DNA than other people. And since our blood (Red and white) Are the only proven healing agents in your body then how can you possibly heal someone else with your body? The only possible explanation for the case that one person heals another is that this person projected his soul and / or spirit into that person, which is witchcraft, not Christianity.