DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Keloid scar on the torso of a 25-year-old man. The patient had been stabbed and operated on six months previously. A keloid is a greatly enlarged scar that grows beyond its original boundaries. It can itch, cause pain or be tender to the touch. During the normal healing process, a scar fills with collagen. Eventually, the collagen should break down, leaving a flat, small scar. However, the scar can overfill with collagen, causing it to swell and enlarge, forming a keloid scar. There is little understanding of why this happens and treatment is by re-excision and radiotherapy.
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