Bullous pemphigoid: an unusual and insidious presentation of breast cancer.

Blistering skin lesions can be associated with internal malignancies, and paraneoplastic pemphigus is the typical blistering disease presenting as a paraneoplastic syndrome [1]. In contrast, bullous pemphigoid, an autoimmune blistering skin disease that rarely involves mucous membranes, is not widely considered in paraneoplastic syndromes [2–4]. No studies have reported bullous pemphigoid as paraneoplastic presentation of breast cancer. We describe a 75-year-old woman with an underlying metastatic breast cancer presenting with bullous pemphigoid. The clinical history of the patient began 3 months previously when she was admitted to another facility for the onset of pruritus and widespread bullous skin lesions.