DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Close-up of a keloid scar on the shoulder of a 64 year old male patient after removal (excision) of basal cell carcinoma (skin cancer). Also known as a rodent ulcer, exposure to sunlight is thought to be the cause of this cancer in most cases. A keloid scar, filled with the protein collagen, continues to grow even after the wound has healed.
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