The bulk update request #8983 is pending approval.

create alias scar_on_arm (0) -> arm_scar (1252)
create alias scar_on_leg (0) -> leg_scar (1093)
create alias scar_on_legs (25) -> leg_scar (1093)
create alias scar_on_stomach (19) -> abdominal_scar (516)
create alias scar_on_shoulder (12) -> shoulder_scar (418)
create alias body_scar (27) -> scar (82438)
create alias body_scars (195) -> scar (82438)
create alias scar_on_body (50) -> scar (82438)
create alias scar_on_breast (21) -> breast_scar (258)
create alias scar_on_ear (5) -> ear_scar (239)
create alias scar_on_penis (3) -> penis_scar (43)
create alias scar_on_thigh (0) -> thigh_scar (288)
create alias scarred_face (49) -> facial_scar (19103)
create alias scarred_hand (2) -> hand_scar (114)
create alias scarred_nose (1) -> nose_scar (377)
create alias scarred_wing (11) -> wing_scar (11)

Reason: scar_on_[body part] are typically aliased to [body part]_scar.
body scar is just scar by default and it's incredibly underused.
singular scar tags are left while plural are aliased away.