Dermabrasion improves the look of the skin by employing a diamond-tipped rotary instrument to remove or abrade the existing upper layer of skin in a precise manner. The bit spins quickly, taking off and leveling, or planing, the top layers of the skin. This process injures, or “wounds” the skin and causes it to bleed. As the wound heals, new skin grows to replace the damaged skin. Healing typically occurs within about a week.