A blood blister in the mouth appears as a dark red or purple raised bump, filled with blood. This type of blister forms when tiny blood vessels beneath the mouth’s lining rupture, trapping blood under the surface. Most oral blood blisters are common, generally harmless, and resolve on their own. They can develop anywhere in the oral cavity, but are frequently found on soft tissues like the cheeks, tongue, or the roof of the mouth.
Common Causes of Oral Blood Blisters
Accidental trauma is the most frequent reason for blood blisters to form inside the mouth. Biting the cheek, lip, or tongue during eating or speaking can easily damage delicate blood vessels. Consuming hard or sharp foods can puncture or scrape oral tissues, leading to blister formation. Dental procedures, including impressions or local anesthetic injections, may also cause trauma that results in a blood blister.
Thermal injuries from hot foods or liquids can also contribute to their development. Sipping a hot beverage or eating food that is too hot can burn the sensitive lining of the mouth, causing blood vessels to rupture. Strong suction can create enough negative pressure to damage capillaries. Chronic irritation from ill-fitting dental appliances can continuously rub against soft tissues, causing blisters.
While most blood blisters stem from common occurrences, certain underlying medical conditions can increase susceptibility. Conditions affecting blood clotting or rare disorders like angina bullosa hemorrhagica can increase their likelihood of developing blisters. Angina bullosa hemorrhagica causes sudden, benign blisters in the mouth, often without an obvious injury.
When to Seek Medical Advice
While many oral blood blisters heal naturally, there are specific situations when professional medical attention is advisable. If a blood blister is unusually large or continues to grow, potentially interfering with swallowing or breathing, it warrants immediate evaluation. Persistent pain that affects daily activities like eating or speaking also indicates a need for medical consultation.
A blood blister that does not show signs of healing or resolve within one to two weeks should be examined by a healthcare provider. Recurrent blood blisters, especially if they appear frequently or without a clear traumatic cause, could signal an underlying issue that requires diagnosis. If the blister is accompanied by other symptoms such as fever, significant swelling, or signs of infection like warmth, redness, or pus drainage, medical attention is necessary. Any blister appearing in an unusual location or having an atypical appearance should also be assessed by a dentist or doctor.
Caring for a Blood Blister
Proper care for a blood blister in the mouth focuses on promoting natural healing and preventing further irritation or infection. It is important to avoid touching, biting, or otherwise disturbing the blister, as this can delay healing or introduce bacteria. Gentle oral hygiene practices are recommended; using a soft-bristled toothbrush and brushing carefully around the affected area can help maintain cleanliness without causing additional trauma.
Dietary modifications can also aid the healing process. Avoiding sharp, hard, or very hot and spicy foods is beneficial, as these can irritate the blister and cause discomfort. Opting for soft, cooler foods can help prevent accidental rupture and allow the tissue to recover. Resist the urge to pop or drain the blister yourself. This action can increase the risk of infection and may prolong the healing period, as the blister serves as a protective barrier for the damaged tissue underneath. Most blood blisters will rupture on their own as they heal, and the body’s natural processes will then clear the fluid and repair the area.