Abstract
This report presents 2 cases of angina bullosa haemorrhagica (ABH) that were suspected to be induced by oral allergy syndrome (OAS). ABH is characterized by idiopathic oral blood blisters that usually occur during or just after eating. No previous reports have yet identified a clear relationship with allergies, although the physical stimulation of eating hard food has been considered to be one of the causes. OAS is a type of contact allergy caused by food and usually appears during or just after eating. Many patients also complain of itching and other stimulating symptoms. One of the cases of ABH occurred on the buccal mucosa after eating melon, and the other occurred on the soft palate after eating apple. Both patients felt itching in the mouth, and the ABH appeared while the former case was sucking and the latter was stroking the palate with the tongue. Both patients have pollinosis of Japanese cedar and showed positive antibodies against white birch. These findings suggest that OAS could be one of the causes of ABH, and an allergy test, including the antibody to white birch, would thus be helpful in making a diagnosis.
