Black blood blisters on the tongue can be treated differently according to the size and other properties of the blood blisters, generally small blood blisters can be self-absorbed, large blood blisters need to be drained by aseptic puncture, and blood blisters are recurrent and need to be investigated for blood disorders. 1. small blood blisters: small blood blisters on the tongue, most of them are caused by bite trauma during the eating process, and may also be caused by pigmentation, if the volume of blood blisters is small, generally do not need special treatment, usually pay attention to the diet, regular routine, blood blisters are generally able to self-absorption. 2. Large blood blisters: for the presence of residual roots in the oral cavity, poor restorations, sharp edges of the dentition caused by the tongue repeatedly appear large blood bubbles, can not be broken, it is best to go to the hospital stomatology to find a doctor in time to use iodine povidone solution for disinfection, and then use a sterile syringe to extract the blood in the bubble. In addition, it is also necessary to promptly remove the bad restorations, stumps and other irritating factors in the oral cavity, and make occlusal adjustments. 3. Recurring blood blisters: Generally, blood blisters will heal slowly after puncture, if the blood blisters do not go away for a long time and recur repeatedly, it is considered that they may be caused by blood diseases, and it is necessary to go to the hospital to conduct routine blood and coagulation function tests to check.