Oral Blood Blisters: Causes, Symptoms, and Treatment

Oral blister?

Hello Doctor, I recently noticed a bubble-like structure resembling a blood blister on the wall of my throat beneath the tonsils.
However, this experience is different from my past encounters with blood blisters (previously, when I had blood blisters on the oral mucosa, they would resolve without issue and were not painful).
I cannot pop it, and when I look down or do not exert myself, it is not very noticeable; I only feel that the mucosa in the area of the bubble is a deeper color (light purple).
However, when I tilt my head back and open my mouth, the entire bubble appears engorged and becomes larger and darker purple, but it is not painful.
I consulted an ENT specialist, who said it is a blood blister and that medication would help it resolve, but after finishing the medication, it has not gone away.
Could you please advise me if a blood blister typically appears engorged when exerted and is not noticeable when relaxed? Additionally, how long does it usually take for a blood blister to resolve?

robin, 20~29 year old female. Ask Date: 2011/12/30

Dr. Zeng Guanghui reply Dentistry

Hello, thank you for your inquiry.
Here is my response to your question along with some recommendations: The presence of a blister on the pharyngeal wall beneath the tonsils is generally caused by inflammation or infection of the upper respiratory mucosa.
After a few days, the blister may rupture, and the wound will gradually heal.
However, if there is severe inflammation or significant pain, you may take some medications to help reduce inflammation.
As long as your immune system is functioning normally, the blister should heal on its own.
Wishing you peace and happiness.

Reply Date: 2011/12/30

More Info

Understanding oral blood blisters, particularly those that appear in the throat area, can be quite concerning, especially when they differ from previous experiences with similar lesions. Blood blisters in the oral cavity, including the throat, can arise from various causes, and understanding these can help in managing the symptoms and determining the appropriate treatment.

Causes of Oral Blood Blisters
1. Trauma or Injury: Blood blisters often form as a result of trauma to the mucous membranes. This could be from biting the inside of the cheek, aggressive brushing, or even from dental work. The injury causes blood vessels to break, leading to the accumulation of blood under the skin.

2. Infections: Certain viral infections, such as herpes simplex virus, can lead to the formation of blisters in the mouth and throat. These blisters may be painful and can recur.

3. Vascular Malformations: Conditions like hemangiomas or vascular malformations can present as blood-filled lesions in the oral cavity. These are usually benign but can be concerning if they grow or change.

4. Blood Disorders: Conditions that affect blood clotting, such as thrombocytopenia or hemophilia, can lead to spontaneous bleeding and the formation of blood blisters.

5. Allergic Reactions: Allergies to certain foods or medications can cause oral lesions, including blood blisters.

Symptoms
Typically, blood blisters in the oral cavity are characterized by:
- A raised, fluid-filled lesion that may appear dark red or purple.

- The absence of pain or discomfort, although this can vary depending on the underlying cause.

- Changes in size or appearance when pressure is applied or when the head is positioned differently, as you described.

Treatment and Management
1. Observation: If the blood blister is not painful and does not interfere with eating or speaking, observation may be the best course of action. Many blood blisters resolve on their own within a few days to a couple of weeks.

2. Medications: If prescribed, medications may help reduce inflammation or manage symptoms. However, if the blister persists despite treatment, a follow-up with your healthcare provider is essential.

3. Avoiding Irritation: Avoiding spicy, acidic, or abrasive foods can help prevent further irritation of the blister.

4. Oral Hygiene: Maintaining good oral hygiene is crucial. Gentle brushing and rinsing with salt water can help keep the area clean and promote healing.

5. Follow-Up: If the blister does not resolve or if you notice changes in its appearance, it is important to return to your healthcare provider. They may consider further evaluation, including imaging studies or a biopsy, to rule out other conditions.

Conclusion
In summary, while blood blisters in the oral cavity can be benign and often resolve on their own, persistent or changing lesions warrant further investigation. Your observation that the blister appears larger when you are upright or exerting pressure is consistent with how blood blisters behave, as they can fill with more fluid under pressure. If the blister does not resolve or if you experience new symptoms, it is advisable to seek further medical evaluation to ensure there are no underlying issues that need to be addressed. Always consult with your healthcare provider for personalized advice and treatment options based on your specific situation.

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