Dermatitis herpetiformis and bullous pemphigoid. Intermediate and mixed forms

Area of Science:

• Dermatology
• Immunodermatology
• Autoimmune blistering diseases

Background:

• Dermatitis herpetiformis (DH) and bullous pemphigoid (BP) are distinct autoimmune blistering diseases.
• Some patients present with overlapping clinical and histological features of both DH and BP.

Purpose of the Study:

• To investigate patients with features suggestive of both DH and BP.
• To evaluate treatment responses and immunofluorescence findings in these overlapping cases.
• To propose a classification for these challenging cases.

Main Methods:

• Clinical and histological assessment of nine patients.
• Treatment trials with sulfapyridine, sulfones, and prednisone.
• Direct and indirect immunofluorescence studies for antibody deposits.

Main Results:

• Five patients showed partial or complete response to sulfapyridine or sulfones.
• Two patients required combined treatment with prednisone for disease control.
• Immunofluorescence revealed IgA deposits in all patients and IgG in five; no circulating anti-BM antibodies were detected.

Conclusions:

• The distinction between DH and BP should be maintained despite overlapping features.
• An "intermediate or mixed form of DH and BP" is suggested for unclassifiable cases.
• This classification aids in managing patients with ambiguous presentations.