Blood Blister In The Mouth: Symptoms, Causes & Treatment!

Blood blisters in the mouth are the result of various reasons, like trauma or breaking of blood lining in the mouth. They appear where the mouth`s blood vessels below the lining break. They might occur on the mouth`s walls, gums, inside the tongue or cheeks.

Blood Blister In The Mouth

They may be really painful and might hamper the swallowing or chewing of food.

Table of Contents

What Is a Blood Blister & How Is It Formed?

Blood blisters in the mouth seem to be tiny red bumps filled with blood. Their fluid consists of lymph, serum, blood as well as other body fluids that are found beneath the human skin.

Blood blisters form when the skin`s blood vessels become damaged without noticing any skin being broken. Additionally, blood as well as other fluids of the body flow into the tissues from the surrounding area. Due to this reason, that affected area seem irritated or with lesions filled with purple or red fluid.

Some of the people out there who have experienced this condition describe blood blisters as bubbles of blood in their mouth.

Typically, a blood blister appears to be raised above the skin. Still, not all of them are raised, but instead some of them remain flat. They way these blisters look depends quite a lot on how tough the affected skin is, but also on the extent of the damage or the blood amount as well as other fluids which may flow under the skin. – Visit this page!

A blood blister varies in size due to various causes. Some of them are quite large (gigantic even) while other ones are very small. However, other ones might be quite small or medium in size. Frequently, a blood blister might recur, which is a sign that there is an underlying cause which hasn`t been addressed.

Are these oral blood blisters harmful? In general, their undesirable effects include difficulty when eating or speaking, and even pain.

What Does A Blood Blister Look Like?

Blood blisters appear in different sizes – some of them are quite small, while other ones can be over half an inch.

While a blood blister in such a delicate location like the mouth might seem intimidating, they typically disappear in a couple of days.

A blood blister can occur above or below the tongue, inside a lip`s wall or on either cheeks.

Symptoms of Blood Blisters in the Mouth

Lots of blood blisters in the mouth are large enough to be noticed or at least feel with the tongue. They might appear just about everywhere in your mouth; however, they are mostly noticed in surfaces that are soft, like tongue, under the lip or underside the cheek. You may notice one or several of them growing at a time.

Oral blisters might range anywhere from purple to dark red, and normally they are painful until they burst. This type of blisters can make things really uncomfortable to brush or chew when using your teeth.

Causes of Blood Blisters in the Mouth

Mouth Injury

Oral blood blisters generally happen due to poor habits when eating, like chewing food that is too hard or hot. – More info!

A major trauma cause is biting the inside of the tongue or cheek. This generally occurs when someone gets distracted when eating with other activities such as engaging in a discussion with someone or watching television.

Allergic Reactions

Did you know that allergies can be a cause of oral blood blisters? If you may experience allergic reactions to particular drinks or foods, it may be the cause of blood blisters. If you generally eat foods rich in citrus, you`re definitely prone to experience them.

In addition, a rather small amount of drugs may trigger allergies, which may stimulate oral blister formation in the long term.

Low Platelet Count

Platelets represent blood components which aids in clotting. If there aren`t enough platelets, blood doesn`t clot as it should and will collect under your skin. This will increase the risk of blood blister occurrence.

Celiac Disease

Alcohol consumption can lead to oral ulcers, which in turn might result in blood blisters. They generally form within the cheeks, under the lips or tongue. Smoking might produce allergies that may take the form of blood blisters.

Also read: Why Are The Veins In My Breast So Prominent?

Nutritional Deficiency

Experiencing a nutritional deficiency may lead to blisters filled with fluid. People who lack vitamin B, vitamin C and iron, frequently experience mouth sores, according to Dr. David Murchison from the Health Professions Advising Center at UT Dallas. This may lead to sore patches in the mouth, which in the end lead to painful mouth ulcers.

Bullous Pemphigoid

An issue with your immunity may lead to a large red blister in your mouth. This particular medical condition is known as bullous pemphigoid and can lead to blisters to occur all of the sudden without clear factors leading up to this.

According to MayoClinic.org, bullous pemphigoid generally affects the human skin. Still, it may also lead to oral sores or blisters to occur. This medical condition has a tendency to affect older people of over 60 years old.

Smoking & Alcohol Consumption

Alcohol consumption might lead to oral ulcers, which in turn might lead to bloody blisters. They generally form within the cheeks, under the lips and tongue.

Smoking might lead to allergies that take the form of oral blisters or on the cheek.

STD, HIV & Herpes

When it comes to bloody blisters in the mouth, you can consider them to be a symptom of mouth infection, which may include herpes simplex. Recurring blisters are commonly associated with herpes simplex. If you experience painful oral blisters filled with fluid, or any other regions like your genitals or eyes, then they may be the result of viral infection due to herpes.

As you may already know, herpes is an infection which can be spread through direct contact. Anyone affected by this contagious infection can spread it through sores or oral sex. Although this infection cannot be completely destroyed through medications, the doctor will still advise you to use antiviral medications which may aid to alleviate the signs.

Read more: Is It Normal To Have A Headache While On Your Period?

Dental Procedures

Dental procedures, such as tooth extractions, might lead to blood clots that in turn may lead to the formation of blood blisters. In this particular situation, you have to be sure it won`t get infected and accumulate pus.


Lots of such blisters come and disappear rather fast, and don`t need any treatment. Here you have a few tips that may help you to manage them:

  • Try and stay away from foods which might irritate your blisters, like salty, spicy or hot foods.
  • Try and avoid popping your blisters. This will increase the risk of infection and delay the healing process. Your blister will on itself naturally.
  • You are able to relive pain using OTC painkillers or ice packs placed on the affected region.

When to Talk to a Doctor?

  • Your blister is so big that it interferes with breathing and swallowing.
  • Your blisters are so painful they interfere with the daily activities. The doctor might be able to prescribe you a soothing mouthwash which might speed up the healing process..
  • Your blisters are recurrent.
  • Your blister might look infected. Symptoms of such infections may include pus coming out of it, red tissue around it, and being warm at touch.
  • It might take between 7 to 14 days to heal completely.


Oral blood blisters might appear due to many reasons. Most of the time, they are benign. Most of them are the result of trauma and resolve with no medical treatment rather fast. Being careful what you eat and how you consume your food will surely help controlling them.

Image courtesy of wikihow.com

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