A characteristic vesiculobullous eruption in patients with chronic lymphocytic leukemia.

We report ten cases of a characteristic vesiculobullous eruption in patients with chronic lymphocytic leukemia. Clinically, six lesions were thought to represent insect bites. All ten patients had bone marrow examinations that confirmed the diagnosis of chronic lymphocytic leukemia. In six of ten patients serum protein and immunoelectrophoresis were performed. Six patients had immunoglobulin disturbances: one polyclonal IgG and IgM gammopathy, two monoclonal IgM gammopathies, two decreased levels of IgA, and one hypogammaglobulinemia. Direct and indirect immunofluorescence procedures were performed on two patients and results were negative. Immunoperoxidase procedures for IgG stained nonspecifically along torn/separated areas of the basement membrane in five patients. No immunohistochemistry was performed on the remaining three patients. The etiology and pathogenesis of these lesions are unknown. We favor the concept that they represent an unusual reaction to an arthropod bite, secondary to the underlying lymphoproliferative disorder. A second, and less likely theory, is that these lesions represent an unusual clinical presentation of bullous pemphigoid in patients with chronic lymphocytic leukemia.