Multiple extra-medullary plasmacytomas of the skin

Multiple plasma cell tumours of the skin may, on rare occasions, precede clinical, radiological and laboratory evidence of systemic myelomatosis. A man presented with several plasma cell tumours of the skin but with no detectable evidence of the disseminated myelomatosis to which he succumbed 16 months later. Multiple cutaneous extra‐medullary plasmacytomas should be regarded as a cutaneous expression of multiple myelomatosis.