The onset of oral blood vesicles is sudden, often occurring in the middle of eating or after choking and coughing. The vesicles swell rapidly, varying in size from small ones like grapes to large ones like walnuts, and are purple or dark red, with thin walls like paper. Easy to break, after breaking the flow of blood, such as non-toxic, can be self-healing. If there is poisoning, the wound surface is eroded grayish yellow, pain is increased, saliva increases. There is swelling and pain, which hinders eating and drinking, and even affects tongue extension and speech. Oral blood blister examination methods are: 1, oral X-ray examination: through the dental special X-ray equipment, the dental lesion part of the film examination. x-ray machine is the generation of X-ray equipment, which is mainly composed of X-ray bulb and X-ray machine power supply and control circuit, and X-ray bulb and by the cathode filament (Cathod) and anode target (Anode) and vacuum glass tube. 2, 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.