What should you know about pemphigus vulgaris in mouth?

Lesions may affect the gums, inner cheeks, palate, tongue, lips, or throat. They often break quickly, leaving sore areas rather than clear intact blisters. Pain with spicy, acidic, hard, or hot foods is common when the lining is inflamed, and brushing may become uncomfortable. Mouth disease can occur before skin findings or alongside them.

Several conditions can resemble mouth pemphigus. A dermatologist or oral-health clinician may inspect the mouth and arrange a biopsy or laboratory testing. Avoid self-treating with leftover antibiotics or steroid tablets, because the correct diagnosis determines safe treatment.

Seek a clinical assessment for persistent mouth erosions, especially when new sores appear. Choose soft, cool foods, sip water regularly, and use a gentle toothbrush if tolerated. Avoid tobacco, alcohol-containing mouthwash, and foods that sting. Do not peel loose tissue or use adhesive products on oral sores.

Treatment may include [Oral Corticosteroid Treatment](/treatments/medical-dermatology/oral-corticosteroid-therapy/) or a targeted immune medicine such as [Biologic Therapy](/treatments/medical-dermatology/biologic-therapy/). A clinician may also address pain, nutrition, and infection risk.

Seek urgent care if swallowing liquids becomes difficult, breathing feels restricted, mouth pain prevents drinking, or you develop marked weakness, dizziness, or very little urine. Fever, pus, facial swelling, or rapidly worsening pain also needs prompt assessment.

Ask whether a mouth or skin biopsy is needed, how to maintain oral hygiene without causing trauma, which foods and medicines to avoid, and how to recognize dehydration or infection. Ask when a dentist or oral-medicine specialist should be involved.