What Is Blood Blister In Mouth: Causes And Treatment

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When the upper layer of skin is wounded, a blister forms, which is a fluid-filled sac. The fluid comes from the wounded tissue and is usually clear. A blood blister in the mouth forms when the fluid pools and acts as a barrier, shielding the wounded skin from further harm. Blood veins beneath the wounded skin may rupture, allowing blood to fill the blister’s “bubble,” resulting in a Blood Blister In Mouth. Most blood blisters occur where there are friction, just as clear blood blisters.

If you’ve ever had the unfortunate experience of biting your cheek while chewing food, you may recall a sore developing in the area. While mouth sores from cheek biting are normally not a cause for concern, what if you find a bloody sore in your mouth? Although finding many blood blisters in the mouth can be alarming, most blood blisters are usually harmless and will heal on their own.

Angina Bullosa Hemorrhagica/ Oral Blood Blister In Mouth

Blood blisters in the mouth is linked to a medical disease called angina Bullosa Hemorrhagica (ABH). These dark red or purplish blisters emerge in the mouth without warning and might linger for many days before bursting. Blood Blisters can rupture on their own or when the person is eating.

Blood blisters can occur anywhere in the mouth, although the soft palate is the most common location.

What Are The Symptoms And Indicators Of ABH?

The first sign is a stinging pain or burning sensation just before a blood blister in mouth appears. The blisters last only a few minutes before spontaneously rupturing (bursting), leaving a shallow ulcer that heals without scarring, discomfort, or pain. They can grow to be one to three centimeters in diameter.

The Soft Palate (the back of the mouth) is the area of the mouth that is most affected.

Blood Blisters can appear in the buccal mucosa (cheek) and tongue on rare occasions. About one-third of individuals experience oral blood blisters in multiple locations.

What Are The Factors That Contribute To ABH?

Minor trauma induced by hot foods, restorative dentistry (fillings, crowns, etc.), or Periodontal Therapy (treatment of gum disease) accounts for more than half of all instances. ABH can also be caused by anaesthetic dental injections and steroid inhalers. In half of the instances, no reason can be found.

Causes Of Blood Blister In Mouth

While the exact cause of many oral blood blisters is unknown, a review in the World Journal of Stomatology suggests that they may be produced by mouth trauma. The following factors may have a role in the development of oral blood blister in mouth:

  • Eating meals that are hard, spicy, or crunchy
  • Getting a dental treatment done, such as taking impressions or placing a crown
  • Getting a local anesthetic shot
  • Inhaling narcotics, such as steroids
  • Oral herpes
  • Having a condition that affects the entire body, such as diabetes

Other Causes Of Blood Blister In Mouth


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The majority of oral blood blisters in the mouth form as a result of oral trauma, such as biting your cheek, burning your mouth with hot food, or puncturing soft tissue with a sharp object, such as a chip. In the case of trauma, a blood blister in the mouth usually appears shortly after the injury.


Certain foods and medicines might irritate the lining of your mouth, causing blood blisters to form. Allergies to the following substances may increase your risk of developing blood blister in the mouth:

Astringents, such as those used in mouthwash and toothpaste acidic foods, such as citrus fruits cinnamon flavor


Platelets are blood vessels that aid in the clotting process. Low platelet counts can occur for a variety of reasons, including during pregnancy or while taking certain drugs like antibiotics and anticonvulsants. It can also happen when platelets are destroyed by the immune system.

Blood blisters in the mouth are a symptom of thrombocytopenia. Every year, around 30,000 new cases are diagnosed in the United States, with women accounting for 70% of the cases.

Other Mouth Sores VS Blood Blisters In Mouth

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Other Blood blisters are canker sores, and fever blisters are all red blood blisters in the mouth. However, there are some distinctions. Canker sores start out as reddish ulcers rather than the dark red to the purple coloration of a blood blister in the mouth. A whitish or yellowish film covers canker sores.

Read more about 7 Amazing Essential Oils For Canker Sores

Blood Blisters From A Fever

The tingling sensation that precedes the formation of a fever blister is common. Most oral Blood blisters, on the other hand, frequently arise unexpectedly. Along with a fever and enlarged lymph nodes, a fever blister may occur. Instead of forming inside the mouth, fever blood blisters in the mouth commonly occur on the lips and under the nose.

Treatment For Blood Blister In Mouth

The majority of lips blood blisters are transient and do not require medical attention. Here are some suggestions for dealing with them and to heal blood blisters:

  • Over-the-counter pain medications and cold packs applied to the wounded area can help ease the pain.
  • Foods that irritate the blood blister in the mouth, such as hot, salty, or spicy foods, should be avoided.
  • Attempting to pop the blister is not a good idea. This raises your risk of infection and slows your recovery. The blood blister in the mouth will pop on its own over time.

Consult Your Doctor If You Experience Any Of The Following Symptoms For Blood Blister:

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  • The blister is so huge that it is obstructing swallowing and breathing.
  • It takes more than a week or two for the wound to heal completely.
  • It’s so excruciatingly uncomfortable that it’s interfering with your daily activities. Your doctor may recommend a calming mouthwash to help speed up the healing process.
  • you might need medical treatment if it is Frequently recurring Blood Blisters appear on a regular basis.

Final Note

If a blood blister in the mouth is especially painful, your dentist can help you manage the discomfort and provide you with medical treatment. According to the World Journal of Stomatology review, they will examine the blood blister in the mouth and may recommend an antibiotic mouthwash or anti-inflammatory medication to relieve any discomfort and speed up the healing process. To avoid aggravating the area anymore, your dentist may advise you to eat a soft diet. After the blood blister in mouth has popped, these therapies may aid in preventing infection.

Blood Blisters in the mouth can be caused by a variety of factors. They’re mostly harmless and most blister heals by themselves. The majority of blood blisters are caused by trauma and heal without medical intervention. It’s possible to keep them at bay by being attentive to how and what you eat.


While at times contributed by guest authors, our content is medically reviewed periodically by professionals for accuracy and relevance. We pride ourselves on our high-quality content and strive towards offering expertise while being authoritative. Our reviewers include doctors, nurses, mental health professionals, and even medical students. 

Do note that any information found on the site does not constitute legal or medical advice. Should you face health issues, please visit your doctor to get yourself diagnosed. Icy Health offers expert opinions and advice for informational purposes only. This is not a substitute for professional medical advice.


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