disease_treatment_results_effect

disease_treatment_results_effect = {
	save_temporary_scope_value_as = {
		name = treatment_result_treatment
		value = flag:$TREATMENT$
	}
	save_temporary_scope_value_as = {
		name = treatment_result_outcome
		value = flag:$OUTCOME$
	}

	#APPLY MODIFIERS (OR REMOVE TRAITS)
	add_disease_treatment_modifier_effect = { TREATMENT = $TREATMENT$ OUTCOME = $OUTCOME$ }

	#RISKY TREATMENT: DETERMINING TREATMENT STRATEGY AND REMOVING BODY PART
	if = {
		limit = { scope:treatment_result_treatment = flag:risky }
		random_list = {
			1 = { #Medicine
				trigger = {
					OR = { #Only use for cancer if no body part can be removed
						NOT = { scope:disease_type ?= flag:cancer }
						AND = {
							scope:disease_type ?= flag:cancer
							has_trait = one_eyed
							has_trait = one_legged
							has_trait = disfigured
							OR = {
								is_female = yes
								is_eunuch_trigger = yes
							}
						}
					}
				}
				set_variable = {
					name = treatment_strategy
					value = flag:medicine
					days = 30
				}
			}
			1 = { #Amputation
				trigger = {
					NOT = { has_trait = one_legged }
					OR = {
						has_amputation_type_disease_trigger = yes
						AND = {
							scope:treatment_result_outcome = flag:failure
							scope:physician = { NOT = { has_trait = lifestyle_physician } }
						}
					}
				}
				add_trait_force_tooltip = one_legged
				increase_wounds_no_death_effect = { REASON = treatment }
				set_variable = {
					name = treatment_strategy
					value = flag:amputation
					days = 30
				}
				if = {
					limit = { has_amputation_type_disease_trigger = no }
					add_character_flag = { flag = physician_used_wrong_method days = 30 }
				}
			}
			1 = { #Disfigurement
				trigger = {
					NOT = { has_trait = disfigured }
					OR = {
						has_disfigurement_type_disease_trigger = yes
						AND = {
							scope:treatment_result_outcome = flag:failure
							scope:physician = { NOT = { has_trait = lifestyle_physician } }
						}
					}
				}
				add_trait_force_tooltip = disfigured
				increase_wounds_no_death_effect = { REASON = treatment }
				set_variable = {
					name = treatment_strategy
					value = flag:disfigurement
					days = 30
				}
				if = {
					limit = { has_disfigurement_type_disease_trigger = no }
					add_character_flag = { flag = physician_used_wrong_method days = 30 }
				}
			}
			1 = { #Castration
				trigger = {
					is_male = yes
					is_eunuch_trigger = no
					OR = {
						scope:disease_type ?= flag:cancer
						AND = {
							scope:treatment_result_outcome = flag:failure
							scope:physician = { NOT = { has_trait = lifestyle_physician } }
						}
					}
				}
				add_eunuch_trait_effect = yes
				
				increase_wounds_no_death_effect = { REASON = treatment }
				set_variable = {
					name = treatment_strategy
					value = flag:castration
					days = 30
				}
				if = {
					limit = { NOT = { scope:disease_type ?= flag:cancer } }
					add_character_flag = { flag = physician_used_wrong_method days = 30 }
				}
			}
			1 = { #Remove eye
				trigger = {
					NOT = { has_trait = one_eyed }
					OR = {
						scope:disease_type ?= flag:cancer
						AND = {
							scope:treatment_result_outcome = flag:failure
							scope:physician = { NOT = { has_trait = lifestyle_physician } }
						}
					}

As written in game/common/scripted_effects/20_health_effects.txt.