DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Benign tumour on the skin of a 56-year-old man. This is a benign (non-cancerous) fibrous histiocytoma, a painless pigmented firm mass. It contains macrophages and histiocytes, cells of the body's immune system, and is often found on the skin of the extremities. Treatment is with surgical removal.
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