Infliximab, a chimeric mouse-human monoclonal antibody, blocks the action of tumor necrosis factor-alpha and is a highly effective treatment for several inflammatory disorders, including inflammatory bowel disease and rheumatoid arthritis. Although safety data are encouraging, immunosuppressive sequelae may result. We report the acute development of multiple squamous cell carcinomas and keratoacanthomas in a patient receiving infliximab for rheumatoid arthritis.
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