How is guttate psoriasis diagnosed?

Updated: Oct 16, 2020
  • Author: Kirstin Altman, MD; Chief Editor: Dirk M Elston, MD  more...
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A careful history should be taken to exclude certain drugs, such as beta-blockers and lithium, which may cause an eruption similar to that of guttate psoriasis. Viral exanthema should also be considered.

Especially in patients with palmar and plantar lesions, serologic analysis should be performed to exclude secondary syphilis. Skin biopsy is probably the single most useful diagnostic test if the clinical diagnosis is not certain.

Histopathologic findings and severity do not correlate with the clinical severity or the Psoriasis Severity Index. [49]

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