EVAN OTO / SCIENCE PHOTO LIBRARY EVAN OTO / SCIENCE PHOTO LIBRARY
Illustration of a section of skin with moderate 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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