DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Skin cancer. Nodular basal cell carcinoma on a 75-year-old man's temple. Basal cell carcinoma is one of the most common forms of skin cancer, and is most often caused by over-exposure to sunlight. The cancer starts as a small flat nodule and grows slowly, eventually breaking down at centre to form a shallow ulcer that persistently bleeds. Basal cell carcinomas rarely spread to other parts of the body. Treatment involves the surgical removal of the tumour or radiotherapy.
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