EVAN OTO / SCIENCE PHOTO LIBRARY EVAN OTO / SCIENCE PHOTO LIBRARY
An illustration depicting mild psoriasis, as well as a section of skin affected by the disease. Psoriasis is characterized by inflamed areas of skin which develop plaque lesions exhibiting a rough scaly surface. Psoriasis is an autoimmune disease in which the immune system targets skin cells, stimulating the growth of more cells at the site, resulting in the raised and scaly appearance. The severity of this condition is determined by how much of the body is covered in these lesions, and can sometimes lead to inflammation of the joints, leading to psoriatic arthritis.
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