A. Kayal - Department of Dermatology Nantes Université, CHU Nantes Nantes France
M. H. Tessier - Department of Dermatology Nantes Université, CHU Nantes Nantes France
J.‐C. Fricain - Department of Odontology and Oral Health, CHU de Bordeaux Bordeaux University Hospital Bordeaux France
E. Vigarios - Department of Stomatology, Claudius Regaud Institute Institut Universitaire du Cancer Toulouse‐Oncopole Toulouse France
V. Seta - Department of Maxillofacial Surgery Angers University Hospital Angers France, Departement of Dermatology Cochin Hospital, AP‐HP Paris France
C. Isnard - Department of Dermatology, AP‐HP Cochin Hospital Paris France
C. Husson - Private Practitioner Paris France
C. Le Roux-Villet - Department of Dermatology, Referral Center for Auto‐Immune Bullous Dermatosis, Avicenne Hospital, AP‐HP Sorbonne Paris North University Bobigny France
A. Du-Thanh - Dermatology Montpellier University Hospital, CHU de Montpellier Montpellier France
C. Girard - Dermatology Montpellier University Hospital, CHU de Montpellier Montpellier France
G. Velut - Nantes Université
M. Samimi - Dermatology Trousseau‐Chambray University Hospital, CHRU Trousseau‐Chambray Chambray‐les‐Tours France
M. Kayal - Department of Gatroenterology Sud Francilien Hospital Center Paris France
M. Le Moigne - Nantes Université
the GEMUB Group and the French Society of Dermatology