DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Skin cancer. Squamous cell carcinoma (SCC) on an 81-year-old woman's forehead, two weeks after a session of radiotherapy treatment. An SCC arises from the uncontrolled proliferation of squamous cells, the flattened cells in the skin and mucous membranes. A large ulcer-like area can form, that in its advanced stages spreads round the body. An SCC is most commonly caused by sunlight. Treatment can also use surgical excision and chemotherapy.
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