09/17/2026
A blood blister in your mouth can look alarming. Have you heard of angina bullosa hemorrhagica (ABH)?
ABH is a benign condition that causes sudden blood-filled blisters inside the mouth, sometimes after minor irritation from hard or crunchy foods. These blisters often heal on their own, but an examination helps confirm the cause.
Avoid popping or picking the blister. Have a first, unexplained, or recurring blister evaluated, and get any mouth sore lasting more than two weeks checked. Difficulty breathing or swallowing, or rapidly worsening throat swelling, requires emergency care.
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At the Center for Oral Pathology, we collaborate with dentists, physicians, ENTs, dermatologists, and other specialists to support patients with:
• Oral pathology and oral medicine concerns
• TMD and orofacial pain
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