mucous membrane pemphigoid prognosisbenign mucous membrane pemphigoidmucous pemphigoidmucous membrane diseaseocular pemphigoid picturesocular citracal pemphigoidoral mucous membrane pemphigoidmembrane pemphigoidmucous membrane pemphigusautoimmune disease mucous membranesmucous membrane disorder symptomsocular cicatricial pemphigoid biopsy