MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Psoriasis on the hand. Artwork from Robert Willan's 1808 medical textbook, On Cutaneous Diseases, showing what he calls psoriasis palmaria, or psorasis affecting the palm of the hand. Psoriasis is a condition caused by skin cells replicting more rapidly than normal, leading to inflamed patches, or plaques. Willan (1757- 1812) founded the science of dermatology.
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