The bulk update request #8983 is pending approval.

create alias scar_on_arm (0) -> arm_scar (1374)
create alias scar_on_leg (0) -> leg_scar (1200)
create alias scar_on_legs (28) -> leg_scar (1200)
create alias scar_on_stomach (20) -> abdominal_scar (559)
create alias scar_on_shoulder (17) -> shoulder_scar (449)
create alias body_scar (27) -> scar (85285)
create alias body_scars (209) -> scar (85285)
create alias scar_on_body (0) -> scar (85285)
create alias scar_on_breast (27) -> breast_scar (277)
create alias scar_on_ear (5) -> ear_scar (241)
create alias scar_on_penis (3) -> penis_scar (45)
create alias scar_on_thigh (0) -> thigh_scar (333)
create alias scarred_face (53) -> facial_scar (20306)
create alias scarred_hand (2) -> hand_scar (122)
create alias scarred_nose (1) -> nose_scar (397)
create alias scarred_wing (11) -> wing_scar (12)

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.