The most common techniques include skin grafts, where healthy tissue is transferred from the same patient to cover damaged areas; flaps, which allow tissue to be transferred from areas adjacent to the injury while preserving its blood supply; and reconstructive microsurgery, which consists of transplanting tissue from one part of the body to another, which may be skin, fat, muscle, bone, nerve or a combination of these. The donor area is carefully chosen in areas where scars can be hidden and where the tissue removed does not affect essential functions.