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Cutaneous macroglobulinosis deposits in a patient with IgM paraproteinemia/incipient Waldenström macroglobulinemia

A 43‐year‐old healthy patient developed disseminated flat skin‐colored to red‐brown papules over a few months. These papules were the result of cutaneous IgM deposits representing the first symptom of a hitherto undiagnosed IgM paraproteinemia. This extremely rare skin manifestation of IgM paraproteinemia e. g. possibly incipient Waldenström macroglobulinemia should be included in the histopathological differential of eosinophilic dermal deposits.