Psoriasis is common, carries a substantial burden even when not extensive, and is associated with widespread treatment dissatisfaction.

By R. Stern, T. Nijsten, S. Feldman, D. Margolis, T. Rolstad. Journal of Investigative Dermatology Symposium Proceedings, 2004

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Psoriasis prevalence among adults in the United States. (2014, methodology): “91% to over 2%.(15,17,24,26) These prevalence rates are comparable with those found in the United Kingdom and Europe but are higher than those found in Asia (\0.”
Guidelines of care for the management of psoriasis and psoriatic arthritis: Section 1. Overview of psoriasis and guidelines of care for the treatment of psoriasis with biologics. (2008, background): “The QOL impact of psoriasis may be large even in patients with small areas of involvement.(6,68) For example, psoriasis of the palms and soles tends to have more impact than far more extensive involvement on the trunk.”
Global epidemiology of psoriasis: a systematic review of incidence and prevalence. (2013, background): “69)) only in women, which was consistent with other studies conducted in the United States (Stern et al., 2004; Kurd and Gelfand, 2009).”
Brodalumab, an anti-interleukin-17-receptor antibody for psoriasis. (2012, neutral): “Leading to withdrawal from study 0 0 0 0 1 (2) 1 (1)”
Epidemiology of psoriatic arthritis in the population of the United States. (2005, neutral): “Male 216 (40) 28 (42) 12% (8, 17 ) Female 314 (60) 43 (58) 10% (8, 14) P = .79”
Prevalence and treatment of psoriasis in the United Kingdom: a population-based study. (2005, background): “2%.(5) Other epidemiologic studies from around the world have estimated the prevalence of psoriasis to be 0.”