US NATIONAL LIBRARY OF MEDICINE / SCIENCE PHOTO LIBRARY US NATIONAL LIBRARY OF MEDICINE / SCIENCE PHOTO LIBRARY
Cases of extensive epithelioma (left) and rodent ulcer (right), historical medical illustration. Epithelioma is an abnormal growth of the epithelium, a layer of tissue that covers the surfaces of organs and other parts of the body. It may be benign or malignant. A rodent ulcer (basal cell carcinoma) is a common form of skin cancer, and is most often caused by over-exposure to sunlight. From Atlas of Venereal and Skin Diseases by Prince Albert Morrow, published in 1889.
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