Distribution of both bullous pemphigoid (BP) patients with (white column) and without (gray column) mucosal involvement according to erythema/urticaria BP Disease Area Index (BPDAI) values (A) and blisters/erosions BPDAI values (B) at the time of diagnosis. No statistical differences were observed between the distributions of these two BP groups according to the Kolmogorov–Smirnov test, although a clear different distribution could be visualized within the low (0–19) and within the high (50–79) values of the blisters/erosions BPDAI values (B).