A black blood blister in the mouth may be a hematoma caused by bite wounds or bad eating habits, and may also be caused by thrombocytopenic purpura, or hemangioma.
1. hematoma: if accidentally biting the oral mucosa, or eating too hot or too hard food, resulting in oral mucosal blood vessel rupture, etc. will cause hematoma, with the prolongation of time can be manifested as black blood blisters.
2. Thrombocytopenic purpura: black blood blisters in the mouth may also be thrombocytopenic purpura, mainly associated with autoimmune disorders, genetic factors, thrombotic microangiopathy, etc., the patient’s platelet reduction, the oral cavity or other parts of the purpura.
3. Hemangioma: a black blood blister in the mouth may also be a hemangioma, which is caused by abnormal proliferation of vascular endothelium. It may be benign or malignant.
There are many reasons that lead to a black blood blister in the mouth, if it can not be eliminated or has increased in size, increase and so on, you should consult a doctor in time.