A man in his 60s presented with a painless rapidly enlarging ulcer on his left leg 1 week after the onset of diverticulitis, a neutropenic fever, and severe sepsis due to multidrug-resistant Pseudomonas aeruginosa infection that necessitated admission to the intensive care unit. His medical history included a heart transplant for ischemic cardiomyopathy in his early 50s, and he was receiving long-term immunosuppressive therapy with cyclosporine, mycophenolate mofetil, and deflazacort. He had received a diagnosis of plasmablastic lymphoma 6 months earlier and was being treated with polychemotherapy (cyclophosphamide, doxorubicin hydrochloride, vincristine sulfate, and prednisone [CHOP] regimen).