Abstract
Schnitzler syndrome (SchS) is a rare autoinflammatory diseases characterized by chronic urticaria and monoclonal IgM or rarely IgG gammopathy. In 2019, a policy study by Ministry of Health, Labour and Welfare, Japan conducted a survey of major dermatology departments in Japan. 109 of 355 facilities (31%) responded, and 7 cases were identified. In addition, a systematic search of PubMed and Ichushi using the keywords “Schnitzler syndrome” and “Japan” identified 10 cases published in English and 22 cases in Japanese.
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