There could be many weird ways of 'healing' (that I'm sure Genji would love) like injury deflection, transference, erasure via memory, taking a photo of an injury then editing/developing differently so as to get rid of injuries (surface-level anyway), connecting the injury to who or what caused it then destroying it to 'destroy' the injury/history of it in a sense, 'borrowed' flesh, pain sharing where one's total damage is minimized among a selected crowd...Or, y'know, medicine & rest (some of that tender love & care).