Keloids and hypertrophic scars are raised, often itchy scars that develop at the site of a wound. They are considered benign (harmless) tumors, but can cause serious cosmetic problems.

Keloids and hypertrophic scars look alike. They tend to be shiny and smooth skin elevations that may appear pink, purple or brown.

Although they are similar in appearance, there are several differences between keloids and hypertrophic scars:

• Hypertrophic scars stay within the boundaries of a wound site, but keloids extend beyond them.
  
  
• Hypertrophic scars are more common and are usually smaller than keloids.

The cause of both types of scars is unknown, but it appears to be genetic. The scars result from excessive collagen production in the skin, typically after injury (e.g., burns, infections).

Keloids and hypertrophic scars are usually diagnosed during a physical examination that includes a complete medical history and list of medications. Physicians can usually diagnose these scars simply by looking at them.

There are numerous ways to treat keloids and hypertrophic scars, such as corticosteroid injection, silicone gel sheeting and laser therapy. More than one treatment technique may be used to treat scars.