A Study to Evaluate CM336 in Adults with Autoimmune Bullous Disease

Inclusion Criteria: * 1\. Confirmed diagnosis of autoimmune bullous disease； * 2\. Age ≥18 years, regardless of gender； * 3\. Voluntarily signed informed consent form, with understanding of the study's nature, purpose, procedures, and willingness to comply with trial requirements. Exclusion Criteria: * 1\. History of clinically significant diseases that, in the investigator's judgment, may pose safety risks to the subject during participation； * 2\. Prior treatment with anti-B-cell maturation antigen (BCMA) therapy； * 3\. History of allergic reactions to humanized monoclonal antibodies or known allergy to any component of CM336； * 4\. Any other condition deemed by the investigator to render the subject unsuitable for study participation.