Oral blood blisters are a common oral disease. Recurring oral blood blisters seriously affect our daily life, and severe oral blood blisters may also be cancerous. Although the surface symptoms of oral blood blisters look similar, they are actually different. The symptoms of oral blisters can be different from one cause to another. If you are not sure of the cause of your oral blood blisters, and oral blood blisters are still recurring and getting more and more serious, you must go to a hospital specialized in the treatment of oral diseases for examination to clarify the cause. Inspection methods: 1, simple oral blood blisters, oral visual examination can be. 2, such as oral blood blisters for a long time or for other diseases accompanying symptoms, the primary disease should also be checked. If it is a non-specific inflammatory disease, the initial appearance of severe vascular and inflammatory reaction, the formation of ulcers, its surface is covered with fibrinous pseudomembrane, a small amount of necrotic tissue below, the intrinsic layer has a large number of inflammatory cell infiltration, collagen fibers can be edematous, glassy changes or fracture disappears, the lesions of periglandular stomatitis and the above basic changes, but the scope is large and deep, and salivary glandular alveoli destruction, ductal expansion, epithelial hyperplasia. 3, oral blood blisters are very serious and the cause of the disease is unknown, must be examined with the help of instruments. Commonly there are oral endoscopy, the emergence of oral endoscopy, for the oral aspects of the examination and treatment brought a new model, when the patient’s lesion scene is displayed in front of the patient, without more description or expertise. Patients can also understand the urgency of treatment. The physician can further detect the patient’s oral lesions with the aid of clear visual images and various treatment measures taken in a timely manner.