Steroid resistant bullous pemphigoid induced by pembrolizumab in a patient with metastatic lung adenocarcinoma: case report and review of the literature

This report adds to the growing body of evidence on IRAEs, particularly BP induced by ICIs, and suggests that methotrexate can be an effective treatment for steroid-resistant BP in the context of cancer immunotherapy. Further research is needed to better understand the mechanisms and optimal management strategies for ICI-induced BP.