Scar revision reduces the prominence of certain depressed cutaneous scars. Although many scars fade over time and become barely noticeable, disruptions to the healing process can cause them to become red, raised, indented or otherwise deformed. Subcision is a procedure for treating scars that are indented. A needle is directed into the skin to break up the fibres that attach the scar to below-the-surface tissue, raising it back to the elevation of surrounding skin. It also promotes healing by creating new connective tissue that repairs and smooths the skin.