US NATIONAL LIBRARY OF MEDICINE / SCIENCE PHOTO LIBRARY US NATIONAL LIBRARY OF MEDICINE / SCIENCE PHOTO LIBRARY
Psoriasis. Historical medical illustration showing psoriasis on the whole body and on the arm and hand. Psoriasis is an autoimmune disease in which skin cells are over-produced, resulting in patches (plaques) of scaly, thick skin, which are often itchy and may become infected. From Atlas of Venereal and Skin Diseases by Prince Albert Morrow, published in 1889.
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