number of patients with decrease of blisters' number of at least 20% after 3 months of treatment by oral erythromycin at 3 months of treatment [clinicaltrials_resource:db41fee07b6bf760b57bedbea73340e5]

Principal end point is evaluated at inclusion and after one month of treatment, 3 months of treatment and 2 months after the end of the treatment

number of patients with decrease of blisters' number of at least 20% after 3 months of treatment by oral erythromycin at 3 months of treatment [clinicaltrials_resource:db41fee07b6bf760b57bedbea73340e5]

Principal end point is evaluated at inclusion and after one month of treatment, 3 months of treatment and 2 months after the end of the treatment