Psychic surgery is a highly specialized form of surgery that only works on other psychics. This is possible because, and many people aren't aware of this, psychics can meld skin kind of like Odo and the changelings on Deep Space 9. They can do this because they're advanced brains run too hot so their skin melts. So they like goop their hands into your psychic stomach to goopify all of those intestine gremlins, but then the psychic has to absorb your goop into their goop, bonding with the gremlin's power level. This, as we all know, is how psychics get so powerful, but also why they're so afraid of being touched anywhere on their torso.