Blood blister in mouth

blood blister in mouth

A mouth blister with blood is more like a bump formation on the inner portion like your cheek in the oral cavity. It primarily comprises blood and other fluids. The main reason for the emergence of oral blisters is the breaking of blood vessels underneath the skin. The liquid that oozes from the vessel makes a clot under the skin forming a blood blister.

Causes of blood blisters in the mouth

Oral blood blisters include:





Braces on teeth

Oral herpes

Denture fitting issues

Angina bullosa hemorrhagic is a rare disorder that causes oral blood blisters to form spontaneously. It is not a harmful condition unless a large blister blocks the airway. Some blood blisters are the result of more serious causes, including:


Low platelet count

Oral cancer

Alcohol abuse

Vitamin deficiencies


Many blood blisters in the mouth have no symptoms beyond the blister itself. Some people experience mild pain and burning at and around the site of the blister. Symptoms of a blood blister in the mouth usually resolve when the blister goes away. People may experience other symptoms depending on the underlying cause.


Most blood blisters come and go quickly, and require no medical treatment. Here are some tips for managing them:

You can reduce pain with over-the-counter pain relievers and ice packs applied to the injured area.

Avoid foods that can irritate the blister, such as hot, salty, or spicy foods.

Do not attempt to pop the blister. This increases your risk of infection and delays healing. The blister will pop naturally on its own.

See your doctor if:

The blister is so large it’s interfering with swallowing or breathing.

It takes more than a week or two to heal fully.

It is so painful it’s interfering with your daily functioning. Your doctor may prescribe a soothing mouthwash that can speed healing.

The blisters are recurrent.

The blister seems infected. Signs of infection include being warm to the touch, pus draining out of it, and red tissue around the blister.

Tips for healing and prevention

To help heal blood blisters and prevent them in the future, a person can:

Avoid spicy foods

Remove dentures until a sore heal

Speak with a dentist to adjust dentures if necessary

Speak with a doctor if the blisters recur often or are large

Choose soft foods while the blisters are healing

Avoid popping the blisters


Mouth sores, blood blisters, and cold sores are common issues in the oral cavity. Most blood blisters are due to trauma and quickly resolve without medical intervention. Being mindful of how and what you eat can help keep them at bay.



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