The present disclosure provides provides methods of treating with a BTK inhibitor a blistering disease, in particular pemphigus vulgaris or pemphigus folliaceous in a mammal, use of a BTK inhibitor as a replacement therapy for corticosteroid therapy for diseases treatable with a corticosteroid, such as autoimmune or inflammatory disease and in particular where corticosteroids are used as first or second line therapy, and pharmaceutical formulations comprising the same.
