The purpose of this study is to identify the presence or absence of ectopic lymph node-like structures in skin lesions of patients with autoimmune bullous disease and the subtypes of the cells deposited there. In addition, this study clarifies the therapeutic effect of intralesional steroid injection in patients with pemphigus harboring ectopic lymph node-like structure.

Inclusion Criteria:

<Presence of Ectopic Lymphoid-like Structures in the Skin lesion of Autoimmune Bullous Disease Patients>

Prospective study Inclusion Criteria:

1. Adults over 19
2. Patietns who voluntarily signed the consent form
3. Patients who are diagnosed with autoimmune bullous disease through clinical, histological and serological tests

Retrospective study Inclusion Criteria:

1. Samples in human-derived banks from March 2013 to October 2018
2. Patients who are diagnosed with autoimmune bullous disease through clinical, histological and serological tests
3. Adults over 19 <Treatment of Ectopic Lymphoid-like Structures in the Skin lesion of Autoimmune Bullous Disease Patients>

Prospective study Inclusion Criteria:

1. Adults over 19
2. Patients who voluntarily signed the consent form
3. Patients who have skin lesions harboring ectopic lymph node-like structure in a prospective or retrospective manner
4. Patients who have chronic lesions sustained for more than 4 months during the treatment of systemic corticosteroids

Retrospective study Inclusion Criteria:

1. Patients who have skin lesions harboring ectopic lymph node-like structure in a retrospective manner
2. Paitents who have been treated for intralesional steroid injection
3. Patients who have data of photography to compare the clinical effects before and after intralesional corticosteroid treatment.

Exclusion Criteria:

1. Patients who do not meet the criteria for autoimmune bullous disease