We herein present a rare case of a 42-year-old man with primary cutaneous marginal zone lymphoma (MZL) of the B-cell type on his shin. MZL is known to be the cutaneous counterpart of MALT (mucosa-associated lymphatic tissue) lymphoma. Histopathologically,MZL is characterized by multi-nodular infiltrates of centrocyte-like and centroblast-like margina1 cells with bottom-heavy patterns, lymphoplasmacytoid differentiation, typical distribution of tumor cells in the marginal zone and follicular colonization by tumor cells. This B-cell lymphoma of a benign grade should be differentiated from mantle cell lymphoma and follicular center cell lymphoma. (Ann Dermatol 11(2) 124~128,1999).