Widespread Blisters in an Older Man

This chronic, autoimmune, subepidermal disease mostly affects older persons. Marked by spontaneous remissions and exacerbations, it manifests with tense blisters that usually start on the arms and legs. Your dx?

This chronic, autoimmune, subepidermal disease mostly affects older persons. Marked by spontaneous remissions and exacerbations, it manifests with tense blisters that usually start on the arms and legs.

Your dx?