Research indicates that the disease may result from a disorder in the immune system. The immune system makes white blood cells that protect the body from infection. In psoriasis, the T cells (a type of white blood cell) abnormally trigger inflammation in the skin. These T cells also cause skin cells to grow faster than normal and to pile up in raised patches on the outer surface of the skin.
Read the complete article here:
http://www.webmd.com/a-to-z-guides/psoriasis-causes
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