Global Bullous Pemphigoid Treatment Market Segmentation, By Treatment (Immunosuppressant Medication, Steroids, Antibiotics & Antiseptics, and Pain Relief Medication), Route of Administration (Topical, Injectable, and Oral), Diagnosis (Skin Biopsy, Physical Examination, and Blood Test), End-Users (Clinic, Hospital, and Others), Distribution Channel (Hospital Pharmacy, Retail Pharmacy, and Online Pharmacy) – Industry Trends and Forecast to 2032