The bulk update request #8983 is pending approval.

create alias scar_on_arm (0) -> arm_scar (1218)
create alias scar_on_leg (0) -> leg_scar (1051)
create alias scar_on_legs (23) -> leg_scar (1051)
create alias scar_on_stomach (19) -> abdominal_scar (508)
create alias scar_on_shoulder (11) -> shoulder_scar (404)
create alias body_scar (27) -> scar (81487)
create alias body_scars (192) -> scar (81487)
create alias scar_on_body (50) -> scar (81487)
create alias scar_on_breast (20) -> breast_scar (251)
create alias scar_on_ear (4) -> ear_scar (231)
create alias scar_on_penis (3) -> penis_scar (43)
create alias scar_on_thigh (0) -> thigh_scar (270)
create alias scarred_face (49) -> facial_scar (18764)
create alias scarred_hand (2) -> hand_scar (108)
create alias scarred_nose (1) -> nose_scar (367)
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.