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Pyrin-associated autoinflammation with neutrophilic dermatosis (PAAND) is a rare, monogenic, autoinflammatory disorder caused by mutations in exon 2 of the MEFV gene. Characterized by neutrophilic dermatosis, recurrent fever, and arthralgia, this syndrome presents a diagnostic challenge due to its low prevalence and varied clinical manifestations. Here, we present the case of a 49-year-old Spanish male with severe hidradenitis suppurativa and pyoderma gangrenosum with a heterozygous variant (p.E244K) in the MEFV gene, consistent with PAAND syndrome. This variant has only been documented in one other case with notable similarities. Both patients share Spanish ancestry and present a severe form of hidradenitis suppurativa. Treatment of the disorder presents challenges due to its variable response to standard therapies. Anti-interleukin-1 agents, such as anakinra or anti-tumor necrosis factor (TNF)-α are the therapeutic approaches supported by the most substantial evidence. Our findings highlight the importance of genetic evaluation of MEFV mutations in individuals with neutrophilic dermatosis and systemic symptoms., (© 2024 Japanese Dermatological Association.)

Background: Lipoid proteinosis (LP), also known as Urbach-Wiethe disease, is a rare autosomal recessive genodermatosis, caused by mutations in the ECM1 gene. This results in the deposition of periodic acid-Schiff (PAS)-positive, hyaline-like material on the skin, mucosae and internal organs., Objectives: To present a case report of LP and a systematic review to synthesize the scientific literature on the management of this uncommon and frequently missed diagnosis., Methods: We present a case report of a 48-year-old man with LP who exhibited significant improvement after oral acitretin therapy. To address the lack of large case-control studies on LP treatment, we performed a systematic review of the literature following the PRISMA 2020 criteria. The search was conducted in PubMed, Web of Science, Cochrane and Scopus databases from inception until June 2023. To assess the methodological quality of case reports and case series, we used the Joanna Briggs Collaboration critical appraisal tool., Results: We included 25 studies that met eligibility criteria. Data from 44 patients with a histopathologically confirmed diagnosis were analysed. Treatment ranged from systemic therapies (acitretin, etretinate, dimethyl sulfoxide, corticosteroids, penicillamine) to surgical or laser procedures. Regarding methodological quality, the main discrepancies arose in the reporting of participant characteristics and treatment interventions., Conclusions: Low-dose oral acitretin could have potential in managing LP, exhibiting fewer side-effects compared with other therapeutic agents. Further research is needed to establish more comprehensive and evidence-based treatment guidelines., Competing Interests: Conflicts of interest The authors declare no conflicts of interest., (© The Author(s) 2024. Published by Oxford University Press on behalf of British Association of Dermatologists. All rights reserved. For commercial re-use, please contact reprints@oup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact journals.permissions@oup.com.)