US NATIONAL LIBRARY OF MEDICINE / SCIENCE PHOTO LIBRARY US NATIONAL LIBRARY OF MEDICINE / SCIENCE PHOTO LIBRARY
Xeroderma pigmentosum. Historical medical illustration of a patient with xeroderma pigmentosum (XP). XP is a genetic defect that causes deficiency in the skin's ultraviolet light damage repair mechanisms. Consequently sufferers are extremely sensitive to sunlight, which causes blistering, premature skin ageing, blindness, progressive neurological disorders, and skin cancers. From Atlas of Venereal and Skin Diseases by Prince Albert Morrow, published in 1889.
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