JOHN BAVOSI / SCIENCE PHOTO LIBRARY JOHN BAVOSI / SCIENCE PHOTO LIBRARY
Psoriasis. Illustration of a microscopic view of a slice through the surface of human skin with the disease psoriasis. Psoriasis is caused by a ten- fold increase in the rate at which new skin cells are produced. These cells come from a rapidly dividing layer at the base of the epidermis, shown here in pink. Constant division pushes older cells upwards towards the surface, where they flatten, die, and form a thick layer of painful, flaky skin (top). The layer under the epidermis is the dermis, which contains blood vessels (red & blue) that nourish the skin. Psoriasis is an incurable disease that causes great physical discomfort.
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