Skin Biopsy w/ DIF
vulgaris (and for that matter all autoimmune skin blistering diseases) requires two skin biopsies.
One is a regular biospy (h&e) and the other is an immunofluorescence test (dif). The dif is a very special test that is very specific for these diseases. It is a must to accurately diagnose the condition. Blood tests can be used to help in diagnosis and monitor treatment.