The bulk update request #8983 is pending approval.

create alias scar_on_arm (0) -> arm_scar (1157)
create alias scar_on_leg (0) -> leg_scar (801)
create alias scar_on_legs (20) -> leg_scar (801)
create alias scar_on_stomach (17) -> abdominal_scar (475)
create alias scar_on_shoulder (10) -> shoulder_scar (386)
create alias body_scar (25) -> scar (79623)
create alias body_scars (188) -> scar (79623)
create alias scar_on_body (34) -> scar (79623)
create alias scar_on_breast (15) -> breast_scar (243)
create alias scar_on_ear (2) -> ear_scar (219)
create alias scar_on_penis (3) -> penis_scar (43)
create alias scar_on_thigh (0) -> thigh_scar (113)
create alias scarred_face (49) -> facial_scar (18064)
create alias scarred_hand (2) -> hand_scar (102)
create alias scarred_nose (1) -> nose_scar (354)
create alias scarred_wing (11) -> wing_scar (9)

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.