Drs. Park and Rebowe can also perform scar revision after the formation of scars, improving the appearance of the scar, but not removing the scar. This may involve moving local tissue to improve the scar appearance, reducing the size of the scar, or shifting the scar to a less visible place or direction. A Z-plasty repositions a scar along more natural lines and creases to decrease its visibility and increase length, allowing the wound to heal with less tension. Dermabrasion or laser therapy removes the top layers of skin and as new skin forms, the scar is blunted. Scars can pull tissue together and impair function. These contractures require release and treatment with local tissue flaps, grafts, tissue expansion or larger flap procedures.