
Pyoderma gangrenosum (PG) is an ulcerative skin disease associated with comorbidities and increased mortality; however, the literature on this topic is scarce. To investigate the mortality, prevalence and risk of comorbidities in patients with PG. This nationwide registry nested case–control study included all inpatients and outpatients diagnosed with PG in tertiary dermatology centres in Denmark between 1 January 1994 and 31 December 2016. Each case was matched on date of birth and sex with 10 unique controls. The Danish National Patient Registry was used to identify all patients and to gather information on comorbidity. Information on age, sex, vital status and emigration was obtained from the Danish Civil Registration System...
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