Scar tissue forms as skin heals after an injury (such as an accident) or surgery. The amount of scarring may be determined by the size, depth, and location of the wound; the age of the person; heredity; and skin characteristics including color (pigmentation).
A keloid is an abnormal scar that is thicker, different color and texture, extends beyond the edge of the wound, and has a tendency to recur. It often creates a thick, puckered effect simulating a tumor.
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