Kelo

a sharply elevated, irregularly shaped, progressively enlarging scar, due to excessive collagen formation in the corium during connective tissue repair. It is a benign tumor that usually has its origin in a scar from surgery or a burn or other injury; keloids are generally considered harmless and noncancerous, although they may produce contractures or cosmetic alterations that affect body image. Ordinarily they cause no trouble beyond an occasional itching sensation. Surgical removal is not usually effective because it results in a high rate of recurrence. However, intralesional injection of steroids, cryotherapy, and x-ray therapy often are of substantial help. When x-ray therapy is employed, care must be taken not to destroy the surrounding healthy tissue. adj., adj keloid´al.

An exuberant scar that forms at the site of an injury (or an incision) and spreads beyond the borders of the original lesion. The scar is made up of a swirling mass of collagen fibers and fibroblasts. Grossly it appears to have a shiny surface and a rubbery consistency. The most common locations for keloid formation are on the shoulders, chest, and back. See: illustration

Treatment

The injection of a corticosteroid sometimes helps the lesion regress. Freezing the tissue with liquid nitrogen, applying pressure dressings, treating it with lasers, excising it surgically, or a combination of these treatments may be used, but recurrences are frequent.

A keloid that develops at the site of an acne pustule.