Claim: PCFCL is a type of primary cutaneous B-cell lymphomas with unknown causes
Evidence: PCFCL PCFCL represents about 55% to 60% of primary cutaneous B-cell lymphomas (PCBCL); primary cutaneous marginal zone lymphoma and diffuse large B-cell cell lymphoma, leg type are the other primary cutaneous B-cell lymphomas. The cause of PCFCL is unknown.