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Psoriasis is caused by an immune system disorder involving a type of white blood cell called a T lymphocyte or T cell. While these T cells usually travel through the body to fight off viruses and other foreign substances, in patients with psoriasis they attack healthy skin cells instead, causing an increased production of healthy skin cells and more T cells that build up on the surface of the skin and cause the scaling and patches associated with this condition.

The symptoms of psoriasis can worsen as a result of certain triggers, which may include:

Infections

Injury to the skin

Stress

Smoking

Alcohol consumption

Certain medications

Patients can prevent a flare up of symptoms by avoiding these triggers.