What is psoriasis?

Updated: Jan 30, 2020
  • Author: Ginard I Henry, MD; Chief Editor: Gregory Gary Caputy, MD, PhD, FICS  more...
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Psoriasis is one of the most common dermatoses (see the image below). [25] Its prevalence varies from 0.5-3% of the US population. It appears as a chronic, bilaterally symmetric, erythematous plaquelike lesion with a silvery scale. The lesions classically are located over the extensor surfaces, including the elbows, knees, back, buttocks and scalp. Confluent generalized lesions also may occur. A multifactorial inheritance pattern is suggested. These factors include familial clusters, trauma, streptococcal infection, and endocrine changes. However, most cases occur without a precipitating event.

Psoriasis. Psoriasis.

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