Angina bullosa haemorrhagica
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Angina bullosa haemorrhagica is a condition of the mucous membranes characterized by the sudden appearance of one or more blood blisters within the oral cavity.[1]:ā808ā The lesions, which may be caused by mild trauma to the mouth tissues such as hot foods, typically rupture quickly and heal without scarring or further discomfort.[2] The condition is not serious except in rare cases where a large bulla that does not rupture spontaneously may cause airway obstruction.
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The blisters usually affect the palate or oropharynx, and are often long lived to the extent that patients burst them for symptomatic relief.[3]