BSIP, CAVALLINI JAMES / SCIENCE PHOTO LIBRARY BSIP, CAVALLINI JAMES / SCIENCE PHOTO LIBRARY
Keratoacanthoma nodule on an elderly man's nose. A keratoacanthoma is a benign growth on the skin. Although harmless, the nodule is often removed as it is unsightly. A keratoacanthoma generally grows to around two centimetres in diameter over a few weeks before slowly disappearing. The cause is unknown, but may be related to exposure to sunlight.
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