Multiple primary cutaneous plasmacytomas

Plasmacytoma presents as primary or secondary tumours. Primary lesions arise in the bone marrow and other extrmedullary sites in the absence of systemic disease. Secondary lesions are the result of systemic disease, usually myeloma, but rarely are the product of direct extension from bony lesions. Primary plasmacytomas can be single or multiple. Cases with multiple lesions have a poorer prognosis.1–3 A 60-year-old male presented with multiple violaceous lesions on his right forearm and left posterior shoulder. He was otherwise in good health. Punch biopsies of two lesions were taken and submitted for routine processing. Peripheral blood was submitted for flow cytometry. …