Keloids are the excess growth of scar tissue at the site of a healed skin injury.
Hypertrophic scar; Keloid scar; Scar - hypertrophic
Causes, incidence, and risk factors
Keloids occur from such skin injuries as:
They are more common in people ages 10 to 20, and in African Americans, Asians, and Hispanics. Keloids often run in families. Keloidosis is a term used when many or repeated keloids occur.
A skin lesion that is:
- Flesh-colored, red, or pink
- Located over the site of a wound or injury
- Lumpy (nodular) or ridged
The lesion may itch while it is forming and growing.
Signs and tests
Diagnosis is based on the appearance of the skin or scar. A skin biopsy may be needed to rule out other skin growths (tumors).
Keloids often do not need treatment. They may be reduced in size by:
- Corticosteroid injections
- Freezing (cryotherapy)
- Laser treatments
- Surgical removal
Keloids usually are not medically dangerous, but they may affect the appearance. In some cases, they may become smaller, flatter, and less noticeable over a period of several years.
Exposure to the sun during the first year after the keloid forms will cause the keloid to tan darker than the skin around it. This dark color may be permanent.
Removing the keloid may not be permanent. Surgical removal may cause a larger keloid scar.
- Cosmetic changes that affect the appearance
- Discomfort, tenderness of the keloid
- Irritation from rubbing on clothing or other forms of friction
- Limited mobility (if the keloids are extensive)
- Psychological distress if the keloid is large or disfiguring
- Return of the keloid
Calling your health care provider
Call your health care provider if:
- You develop keloids and want to have them removed or reduced
- You develop new symptoms
You can prevent discoloration from sun exposure by covering the forming keloid with a patch or Band-Aid, and by using sunblock when spending time in the sun. Continue these extra protection measures for at least 6 months after injury or surgery for an adult, or up to 18 months for a child.
Imiquimod cream has recently been used to prevent keloids from forming after surgery, or to prevent keloids from returning after surgery to remove them.
Juckett G, Hartman-Adams H. Management of keloids and hypertrophic scars. Am Fam Physician. 2009;80(3):253-260
Habif TP. Benign skin tumors. In: Habif TP, ed. Clinical Dermatology. 5th ed. St. Louis, Mo: Mosby Elsevier; 2009:chap 20.
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