DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Keloid scar on the arm of a 66 year old man. This scar is due to the removal of a blood vessel for use in a heart bypass. A keloid scar is a scar that fills with the skin protein collagen. In a normal scar the collagen breaks down once the wound has healed, but this fails to happen during the formation of a keloid scar. The scar expands from its original boundaries, and continues to grow even after the wound has healed. This scar is seen 5 months after the surgery to remove the artery. Keloid scars may require surgical removal, sometimes followed by radiotherapy.
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