Rapidly enlarging cutaneous nodules on a full-thickness skin graft following an excision of a squamous cell carcinoma - a diagnostic clue for multiple myeloma.

Cutaneous extramedullary plasmacytomas (EMPs) are rare plasma cell neoplasms of the skin occurring in 2-4% of patients with multiple myeloma (MM). We describe a man diagnosed with IgA lambda MM (Stage III) after rapidly enlarging cutaneous nodules developed in the surgical site of recently excised skin malignancies. Cutaneous EMP must be considered for expanding cutaneous nodules at sites of surgery or trauma.