What is this scar from?

Carotid endarterectomy scar
Beneath angle of mandible, parallel to SCM
What is this scar from?

Fempop bypass
Scars may be above or below the knee with a plastic graft running between the two.
Uses: Blockage in superficial femoral artery
What is this scar from?

Femoro-distal bypass
Uses: Longer occlusions in superfical femoral artery, popliteal artery or arteries in foot