Blood Blisters in Mouth

mouth and blisters

A blister is a fluid-filled sac that happens when an upper layer of skin is injured. The fluid, which is typically clear, originates from the injured tissue. When the fluid swimming pools, a blister kinds and functions as a barrier, protecting the harmed skin from any additional damage.

Sometimes, capillary below the injured skin will burst and blood will fill the blister “bubble,” producing what is called a blood blister. Like clear blisters, the majority of blood blisters appear where there is friction. For example, you might establish a blood blister on your feet when you wear ill-fitting shoes. Or, you may develop a blister on your hands after grasping a rake or oar for an extended period of time. Blood blisters can likewise appear inside the mouth.

Symptoms of Blood Blisters in Mouth

Many oral blood blisters huge enough that you can see them in your mouth or feel them with your tongue. They can occur anywhere in the mouth, but they are typically seen on soft surface areas, such as your cheek, tongue, or on the underside of the lips. You might develop only one or numerous at a time.

Blood blisters in the mouth variety in color from dark red to purple, and are typically painful up until they pop. Oral blood blisters can make it unpleasant for you to chew or brush your teeth.

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Blood blister vs. other mouth sores

Blood blisters, canker sores, and fever blisters can all appear in the mouth, and they are normally red in color. There are distinctions, nevertheless.

Cancer sores

Canker sores normally start as reddish ulcers instead of the dark red to purple coloring of a blood blister. Canker sores are covered by a white or yellowish movie.

Fever blisters

Fever blisters often begin with a tingling feeling where the blister will form. Blood blisters, on the other hand, frequently appear all of a sudden and without caution. A fever blister may appear in addition to a fever and inflamed lymph nodes. Fever blisters often form on the lips and under the nose instead of inside the mouth.

Causes of Blood Blisters in Mouth

Several things can cause the development of an oral blood blister, including:

  • trauma
  • allergies to foods high in level of acidity
  • low platelet count, which is known as thrombocytopenia
  • angina bullosa hemorrhagica, an unusual condition

Chemotherapy drugs and radiation likewise can likewise trigger blood blisters in the mouth.


A lot of oral blood blisters establish following trauma to the mouth, such as biting your cheek, burning your mouth with hot food, or piercing soft tissue with sharp food, like a chip. In the case of trauma, a blood blister generally establishes quickly after the damage occurs.

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Certain foods and medications can irritate the lining of your mouth and cause the advancement of blood blisters. You may be most likely to establish blood blisters from allergies to:

  • acidic foods, like citrus fruits
  • cinnamon flavoring
  • astringents, such as those utilized in mouthwash and toothpaste


Platelets are blood cells that assist the embolism. You can develop a low platelet count for a variety of factors, consisting of during pregnancy or when taking some medications, such as particular antibiotics and anticonvulsants. It can likewise happen when the body immune system damages platelets.

Thrombocytopenia can cause blood blisters in the mouth. About 30,000 brand-new cases are identified every year in the United States and 70 percent of them occur in women.

Angina bullosa hemorrhagica

Angina bullosa hemorrhagica is a rare disorder that triggers uncomfortable blood blisters to all of a sudden appear on the soft tissues of the mouth. The blisters last just a few minutes, then spontaneously rupture.

One study estimates that about 0.5 percent of the population have these types of blood blisters. The blisters vary from other blood blisters in that they are not related to any systemic disorder, like thrombocytopenia, and often no cause can be found.

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Treatment for Blood Blisters in Mouth

The majority of blood blisters reoccur quickly, and require no medical treatment. Here are some ideas for handling them:

  • You can reduce pain with over-the-counter pain relievers and ice bag used to the injured area.
  • Prevent foods that can aggravate the blister, such as hot, salted, or hot foods.
  • Do not attempt to pop the blister. This increases your risk of infection and delays healing. The blister will pop naturally by itself.

See your physician if:

  • The blister is so large it’s hindering swallowing or breathing.
  • It takes more than a week or more to totally heal.
  • It’s so uncomfortable it’s disrupting your everyday functioning. Your doctor may prescribe a relaxing mouthwash that can speed healing.
  • The blisters are recurrent.
  • The blister appears infected. Signs of infection consist of being warm to the touch, pus draining pipes out of it, and red tissue around the blister.


Blood blisters in the mouth can take place for numerous reasons. They are normally benign. Many blood blisters are because of trauma and rapidly solve without medical intervention. Being mindful of how and what you eat can assist keep them at bay.

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