To erase scars is one of the hardest process in plastic & cosmetic surgery.
The process of erasing the scar heavily depends on the time and the place that scar happened and the expectation of the patient.
Surgical method might not be sufficient in erasing the scars. Sometimes, PRP, laser and some else applications might be used.
Surgery, PRP, laser and other methods might be applied separately or in various combinations.
The plastic surgeon decides.