Narcissism runs along a spectrum rather than being a category, and schema therapy treats it by working back to what early life embedded.

Psychotherapy Treatment by conversation between a therapist and a patient, and the arguments about what in it actually does the work.

Schema therapy An approach developed by Jeffrey Young for personality disorders, working on the life patterns laid down in childhood and the modes a person switches between.

Narcissism From a trait to a personality disorder, and whether the people at the far end of it can be treated at all.