Cutaneous B-cell lymphomas constitute a group of diseases that occur less commonly than cutaneous T-cell lymphoma, and are characterized histologically by B-cells that appear similar to those normally found in germinal centers of lymph nodes. Conditions included in this group are: * Diffuse large B-cell lymphoma * Primary cutaneous follicular lymphoma * Primary cutaneous marginal zone lymphoma * Intravascular large B-cell lymphoma * Plasmacytoma * Plasmacytosis