GWEN SHOCKEY / SCIENCE PHOTO LIBRARY GWEN SHOCKEY / SCIENCE PHOTO LIBRARY
An illustrated view of the hand depicting severe psoriasis, an autoimmune disease resulting in inflamed regions of the epidermis that develops a white, scaly surface. The immune system responds to skin cells as foreign pathogens, and stimulates the growth cycle to increase the number of skin cells in the region. Psoriasis is an chronic disease which varies in severity based on how much of the body is affected.
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