IN THIS ARTICLE
What Are Psoriasis Causes and Risk Factors?
Research indicates that the disease results from a disorder in the inflammatory system. In psoriasis, T lymphocytes (a type of white blood cell) abnormally trigger inflammation in the body. These T cells also stimulate skin cells to grow faster than normal and to pile up in raised plaques on the outer surface of the skin.
Those with a family history of psoriasis have an increased chance of having the disease. Some people carry genes that make them more likely to develop psoriasis. When both parents have psoriasis, their offspring have a 50% chance of developing psoriasis. About one-third of those with psoriasis can recall at least one family member with the disease.
Certain risk factors may trigger psoriasis.
Guttate psoriasis. Red drop-like lesions are found on the skin. This type of psoriasis usually occurs after a streptococcal (bacterial) infection. Image courtesy of Hon Pak, MD.
Medically Reviewed by a Doctor on 9/19/2017
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