Biting your cheek accidentally may lead to a sore forming inside; what if you wake up the next day with blood in it? Well, do not worry if the roof of your mouth or cheek has formed a blood blister; they start off scary but ease as time passes.

A red blood blister in the mouth is more common than you think; it is an uncomfortable situation, looks bizarre, and causes pain. The main reason behind its formation is soft tissue trauma; however, if this issue is persistent, it may be something else, such as an infection. Let’s dig in further.

Blood Blister In Mouth

A blood blister is a round fluid-filled bump appearing inside the mouth. These blisters appear when the vessels under the skin burst, recollects, and clots under the skin.

Causes – Oral Blood Blisters

  • Injury because of cheek biting
  • Anxiety issues
  • Allergic reaction
  • Angina bullosa hemorrhagica
  • Braces
  • Ill-fitted dentures

Angina bullosa hemorrhagica (ABH) – Blood blister in mouth

ABH is a disorder that shows up with dark more like a purple blister filled with blood in the mouth cavity. They may appear any time and stay on for a few days before bursting. The healing process is quick and swift after rupturing, fortunately, they heal without leaving a scar.


  • Iron insufficiency
  • Vitamin B12 deficiency
  • Celiac disease
  • Herpes
  • Arthritis
  • Skin rash
  • Allergies
  • Hormonal changes
  • Medications, for example, NSAIDs or steroids
  • Toothpaste
  • Smoking cigarette
  • Eating hard food
  • Local anesthesia
  • Diabetes
  • Dental procedure


A blood blister inside your mouth does not require external help because it either shrinks or bursts itself. If the blister was causing pain in the beginning, it might help relieve pain after popping.

It is important not to let external factors burst the fluid-filled blister in the mouth. Premature popping will result in a vulnerable lesion susceptible to bacterial hit. Make sure not to use alcohol-based mouthwashes. Ice and over-the-counter pain medications work well for managing discomfort.

Are blood blisters and mouth sores different?

Canker sores, blood blisters, and fever blisters all of them appear inside the mouth. They are somewhat similar but not exactly the same; some of the differences are mentioned below:

  • Canker sores are red ulcers with a white or yellowish thin lining. On the other hand, oral blood blisters look dark blue or purple in color.
  • Fever blisters often indicate before coming with a tingling sensation, and later area forms a blister. At the same time, a blood blister appears randomly in the mouth.

Managing blood blisters in the mouth is easy with the following home remedies:

  • Apply ice on the blister
  • Put cucumber slice on it for swelling reduction.
  • Witch hazel cream works well in reducing pain in dry oral blisters.
  • Chamomile tea, with its soothing properties, helps in easing mouth sores.


If the blisters appear often or do not pop after 2 weeks, seek your doctor or dentist immediately. Our dentists in Cypress, TX, at Cypress Dental are here for you. Call 832-427-6620 to set up an appointment.

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