Inclusion Criteria:  1. Hailey-Hailey disease 1-1. Inclusion Criteria  Clinically diagnosed with Hailey-Hailey as confirmed by histopathology and/or genetic analysis. >19 years old Patients who currently have lesions on the axilla and groin Patietns who signed the consent form and Informed Consent in Human Material Research  2. Normal control 2-1. Inclusion Criteria  >19 years old Persions who signed the consent form and Informed Consent in Human Material Research  Exclusion Criteria:  1-2. Exclusion Criteria  Patients who have used systemic steroids or antibiotics within the last 1 month Patients who have used local steroids or antibiotics within the last 2 weeks Patients who have been diagnosed with skin diseases(such as atopic dermatitis) other than Hailey-Hailey disease Patients who are unable to swab or who may have affect a medical condition Patients who have difficulty making clear decisions due to lack of decision-making ability In addition to the above, a person who is considered inappropriate to participate in this study, such as collecting test information, based on the medical judgment of the Principal investigator or Subinvestigator.  2-2. Exclusion Criteria  Persions who have skin diseases(such as atopic dermatitis) or diseases affecting the skin microbes Persions who have used systemic steroids or antibiotics within the last 1 month Patients who have used local steroids or antibiotics within the last 2 weeks In addition to the above, a person who is considered inappropriate to participate in this study, such as collecting test information, based on the medical judgment of the Principal investigator or Subinvestigator.