Angina Bullosa Hæmorrhagica (Oral Blood Blisters)
Angina Bullosa Hæmorrhagica (Angina 'choking / strangling', bullosa 'a blister' & hæmorrhagica
'blood-filled',  initially termed as
traumatic oral hæmophlyctenosis) is the term used to describe benign
and generally,
sub-epithelial oral mucosal blisters filled with blood, which are not attributable to a systemic
disorder or
hæmostatic defect (clotting disorder).
The blood blisters may be confused with other more serious disorders (e.g., dermatitis herpetiformis,
epidermolysis bullosa acquisita, mucous membrane pemphigoid,
cicatricial pemphigoid, pemphigoid amyloidosis,
sufficient findings to rule out the previously mentioned conditions.

The lesions maybe indistinguishable from blood blisters related to low level of platelets (
however blood tests and the absence of areas of bruising (
ecchymosis), nose bleeds (epistaxis) or bleeding from
the gums are helpful signs to rule it out.

Angina bullosa hæmorrhagica (ABH) is a rare acute and benign blood blistering oral disorder that predominantly
affects middle-aged or elderly people (60% of the patients in the range of 45 - 70 years).  Both sexes are equally
Photo of ABH on the left lateral border of the tongue

  • Slightly more than 50% of the cases described are related to the minor trauma of hot foods, restorative
    dentistry (fillings, crowns etc) or periodontal therapy (treatment of gum disease).

  • Other potential causes that have been mentioned in the literature are dental injections of anæsthetics and
    steroid inhalers.

  • A causative factor is not identified in almost 50% of patients.


Lab Studies:

  • Platelet counts and coagulation tests are within normal limits.


  • Performing a biopsy of an intact bulla is difficult because of the short duration of the lesion.

Histologic Findings:

  • The diagnosis is essentially clinical; however, in the cases in which a biopsy has being taken, the microscopic
    examination reveals a sub-epithelial bulla filled with blood and an underlying mild and non-specific mono-
    nuclear inflammatory cell infiltrate that generally is limited to the region of the lamina propria.

  • Performing a biopsy of an intact bulla is difficult because of the short duration of the lesion.  Otherwise, a
    biopsy of a ruptured bulla exhibits just a non-specific ulceration. According to Scully et al, direct immuno-
    staining for immunoglobulin G (IgG), immunoglobulin A (IgA), or C3 consistently are non-contributory.

  • However, laboratory tests are sometimes necessary to rule out any other bullous diseases.


Medical Care:

  • No treatment is required because the blood blisters spontaneously rupture and heal. Coagulation tests and
    platelet count may be indicated to rule out a blood dyscrasia.


  • ABH is a benign condition.

Useful Websites:


New Zealand Dermatological Society (DermNZ)

British Medical Journal


Index Medicus / PubMed

Useful Articles:

BMJ 1997.  Oropharyngeal Blood Blisters are known as Angina Bullosa Haemorrhagica

Brit J Anaesth 2004.  Angina Bullosa Haemorrhagica presenting as Acute Airway Obstruction

Folia Gastroenterol Hepatol 2005.  Traumatic Haemorrhagic Bullae of the Oral Mucosa (Angina Bullosa

J Oral Science 2008.  Angina Bullosa Hemorrhagica of the Soft Palate – A Clinical Study of 16 Cases

Ind J Dermatol Venereol Leprol 2008.  Haemorrhagic Blisters in the Mouth

Asian J Oral Health & Allied Sciences 2012.  Case Report.  Angina Bullosa Hemorrhagica - A Clinical Report

Ind J Dermatol 2012.  Angina Bullosa Hemorrhagica - Report of Two Cases

RFO 2012.  Angina Bullosa Haemorrhagica (ABH) - Diagnosis & Treatment

RSBO 2012.  Angina Bullosa Hemorrhagica - A Rare Condition

BMJ Case Rep 2013.  Case Report.  Angina Bullosa Haemorrhagica

World J Stomatol 2015.  Angina Bullosa Hemorrhagica - An Enigmatic Oral Disease

F1000Research 2017.  Case Report. A Rare Cause of Oral Bullae - Angina Bullosa Hemorrhagica

Int J Oral Maxillofac Surg 2018.  Angina Bullosa Haemorrhagica.  A Systematic Review & Proposal for Diagnostic

Dental Science 2019.  Angina Bullosa Hemorrhagica - Unique Case Report of Blood Blisters
Last Updated 29th December 2019
Photo of ABH on the left soft palate
What are the signs and symptoms of Angina Bullosa Hæmorrhagica (ABH)?

Some patients describe a stinging pain or burning sensation immediately before the appearance of the blood
blister.  The blisters last only few minutes and then spontaneously rupture, leaving a shallow ulcer that heals without
scarring, discomfort, or pain.

Patients do not report a tendency to bleed at other sites.

Family history generally is non-contributory (though there is a suggestion that it can be associated with type II
diabetes, hyperglycemia or a family history of diabetes however there is no conclusive evidence of a cause-and-
effect relationship between the presence of
ABH and glucose metabolism).


  • The lesions reach an average size of 1 - 3 cm in diameter.
  • The soft palate is the most commonly affected site.  Occasional lesions have been reported in the buccal
  • Approximately one third of the patients exhibit blood blisters in more than one location.
  • The oral mucosa attached to bone (ie, ‘masticatory mucosa’ represented by the hard palate and gums) is not
  • Similar lesions in other mucous membranes or the skin have not been reported.