Jean-Philippe Merlio, MD, PhD, Tumor Biology and Tumor Bank, CHU Bordeaux, Pessac, France, talks on the challenges associated with the diagnosis of cutaneous B-cell lymphoma and other lymphoma subtypes, highlighting issues around differing classifications resulting in discrepancies in rates of diagnosis between institutions. This interview took place at the EORTC Cutaneous Lymphoma Group 20-21 meeting in Marseille.