Blood blisters on the lips may be a phenomenon of hemangioma. Hemangioma usually occurs when the blood vessels are malformed or bent due to impact, which can easily form hemangioma, and hemangioma can usually be treated by surgical excision in dentistry, or you can choose local injection of sclerosing agent to promote the receding of blood vessels, which can restore the health of the lips. And usually, if there is a mucous gland cyst, it is also possible to form a light blue blister at this time, which can be mistaken for a blood blister, and in this case, surgical excision treatment is also usually chosen. In the outpatient clinic, it is possible to perform excision, remove the wall of the blister to remove the cyst of the mucous gland, and then suture it, maintaining good oral hygiene, to be able to ensure that there is no scarring and little effect after healing. Basically, it can be fully restored to health and does not affect the appearance. If the blister is located in the corner of the mouth, the healing process is generally slow. It is recommended to maintain good oral hygiene and not to eat spicy and irritating food, so as to promote the healing of the blister.