Generalized pustular psoriasis (GPP) is a life-threatening disease characterized by sudden, repeated episodes of high-grade fever, generalized rash, and disseminated pustules, with hyperleukocytosis and elevated serum levels of C-reactive protein (123260) (summary by Marrakchi et al., 2011). GPP often presents in patients with existing or prior psoriasis vulgaris (PV; see 177900); however, GPP can develop without a history of PV (Sugiura et al., 2013). Palmoplantar pustulosis and acrodermatitis continua of Hallopeau represent acral forms of pustular psoriasis that have historically been grouped with GPP (summary by Setta-Kaffetzi et al., 2013).
GPP in association with sterile multifocal osteomyelitis and periostitis (612852) is caused by mutation in the IL1RN gene (147679).
Capon (2013) noted that the percentage of GPP patients reported to be negative for mutation in IL36RN ranges from 51 to 84%, indicative of genetic heterogeneity in the generalized pustular form of psoriasis.
For a discussion of genetic heterogeneity of psoriasis, see PSORS1 (177900). [from OMIM]
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