IL17A and pemphigus foliaceus: Persistent ER stress impairs mitochondria bioenergetics and leads to mitochondrial swelling,39 which induces mitochondrial dysfunction of AECIIs in PF.8 Thus, we established a PF murine model and observed that, in addition to alleviating PF as previously reported,14 IL‐17A knockout also attenuated BLM‐induced mitochondrial morphological abnormalities in AECIIs.