A scar is skin that forms over a wound as the skin heals. There are five main types of abnormal scars:

  • Keloid —thick scars that grow out from the skin. They spread beyond the site of the wound.
  • Contracture—often the result of a burn injury. The scar appears as a tightening of the skin. This type may also affect muscles and nerves below the skin.
  • Hypertrophic—thick, raised scars. They look like keloid scars but do not spread beyond the site of the wound.
  • Atrophic—thinned out, cigarette paper-like scars
  • Acne —may look like deep pits or be angular and wavelike.

A scar is part of the normal healing process. The scar is made of the same material as the surrounding skin but it is made a little differently. As a result, the scar tissue appears different than the surrounding skin.