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Pustular Psoriasis (cont.)

Diagnosis of Pustular Psoriasis

Your doctor may perform blood tests, including the following:

  • A complete blood count (CBC) will reveal lymphopenia (reduced lymphocytes, a type of white blood cell in the blood) with polymorphonuclear leukocytosis (a large number of another type of leukocyte) as high as 40,000 per microliter of blood.
  • The erythrocyte sedimentation rate is typically elevated, indicating inflammation.
  • Serum chemistry (breakdown of the levels of various components of your blood) can reveal increased plasma globulins (a type protein in the blood) and decreased albumin (a simple protein), calcium, and zinc.

Your doctor may take a small sample of a pustule's contents to perform a culture. The results from these cultures and blood cultures are usually negative (no sign of infection). A Tzanck test (test for altered skin cells) usually reveals no abnormalities. Viral cells also aren't found. Since your skin is damaged, it may become infected, and the cultures are important.

Medically Reviewed by a Doctor on 5/8/2014

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