DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Pyogenic granuloma. Close-up of a chronically inflamed and pus-producing aggregation of cells on the finger of a 60 year-old woman, known as a pyogenic granuloma. Granulomas usually occur as a reaction to the presence of certain infectious agents or foreign bodies. They may also occur for no apparent cause.
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