Supplementary Material for: Evolution of Bullous Pemphigoid Clinical Pattern over Time: A 17-Year Single-Centre Retrospective Survey of 312 Cases

Background and Objectives: Bullous pemphigoid (BP) clinical profile may have evolved during the last 2 decades. A retrospective, single-centre analysis investigated a possible shift of clinical presentation of the disease over time regarding both lesions’ clinical pattern and locations and more particularly an increased frequency of characteristics considered as less classical regarding the usual clinical description of BP. Patients and Methods: Initial clinical data from all BP patients treated between January 2001 and April 2017 in a reference centre were collected and compared between four 4-year successive chronological subsets (G1 to G4). Results: 213/312 patients retained for final analysis (68.3%) displayed at least one initial non-classical characteristic, mainly head and neck, palmo-plantar, and/or mucosal involvement. Chronological analysis confirmed a significant increase over time of the percentage of patients displaying such features (G1 57.9% vs. G4 73.7%, p = 0.041). Conclusion: Changes in BP clinical pattern may have occurred over the last two decades with the progressive emergence of forms with a number of less classical features. No significant clinical difference was observed between patients receiving or not DPP4 inhibitors at the time of diagnosis