LAUSR

Background: Case reports have suggested an association between dipeptidyl peptidase‐4 inhibitors (DPP4is) and development of bullous pemphigoid (BP). Objective: To evaluate the association between DPP4i treatment and development of BP. Methods: We conducted a retrospective 1:2 case‐control study, comparing case patients with diabetes and BP with age‐ and sex‐matched control patients with diabetes issued from Swiss (Bern) and French (Marseille) dermatologic departments from January 1, 2014, to July 31, 2016. Results: We collected 61 case patients with diabetes and BP and 122 controls. DPP4is were associated with an increased risk for development of BP (adjusted odds ratio, 2.64; 95% confidence interval, 1.19–5.85; P = .02), with vildagliptin showing the highest adjusted odds ratio (3.57 [95% confidence interval, 1.07–11.84; P = .04]). Stratified analysis showed a stronger association in males and patients age 80 years or older. DPP4i withdrawal and the initiation of first‐line treatments led to clinical remission in 95% of cases. Limitations: This was a retrospective study in tertiary referral hospitals. We focused the analysis on DPP4i intake, without analyzing the potential isolated effect of metformin. Conclusions: DPP4is, especially vildagliptin, are associated with an increased risk for development of BP. Their use needs to be carefully evaluated, particularly in high‐risk patients, such as males and those age 80 years or older.