Some scars, however, need surgical excision to look better.  Deep acne pits, sharp-edged depressed scars, inverted  scar lines (trough-like), or scars crossing maximum tension lines require excision. By carefully considering each scar and its relationship to the surrounding natural skin lines, a repair can be designed to improve each scar’s appearance. Z-plasty, M-plasty, and other complicated repairs can be used when necessary. All repairs will be improved by resurfacing with either the CO2 or Fraxel lasers performed 8 weeks after surgery.