Topical Steroids Alone or Associated With Methotrexate in Bullous Pemphigoid

Inclusion Criteria: * Subjects aged 18 years old or more * Patients affiliated to social security system, * Bullous pemphigoid diagnosed according to the following criteria: presence of at least 3 of the 4 clinical criteria for bullous pemphigoid as published by the french group for study of blistering diseases (positive predictive value: 95 %: age over 70 years, no lesions on neck or head, absence of atrophic scars, no mucosal lesions.= Histological Examination consistent with BP diagnosis and carried out in the month before inclusion: existence of a sub epidermal blister regardless of its size, containing neutrophils and / or eosinophils associated with a dermal infiltrate consisting of neutrophils and / or eosinophils, or to margination of neutrophils and / or eosinophils along the dermoepidermal junction.= Direct immunofluorescence performed (DIF) in the month preceding inclusion and showing linear deposition of IgG and / or C3 along the dermo-epidermal junction. * Patients: = no prior topical steroid or superpotent topical steroids for less than 16 days using the same or equivalent dosage as the one used in the study a different regimen and this regardless of the clinical resultsOR receiving potent or superpotent topical steroids for at least 16 days with a different regimen than that used during the trial AND not controlled by this treatment (appearance of at least 3 new blisters per day) * written consent of the patient or, if not possible, certified by a third party,…