[Cutaneous involvement in multiple myeloma--case report and literature review]

Cutaneous involvement in multiple myeloma is a very rare clinical problem. It occurs in less than 1% myeloma patients. Skin manifestation may be primary or secondary to MM. Primary involvement (PCP) according to the current WHO classification is one of the marginal zone lymphomas of the skin. PCP are characterized by significantly better prognosis than infiltrations secondary to MM. Skin manifestations require a thorough diagnosis to differentiate between myeloma-specific changes, MM-associated and non-specific skin disorders. Isolated primary infiltration can usually be successfully treated with radiation therapy or surgery. So far treatment of multiple and secondary to MM involvement are not satisfactory.