Female 69 years old recently ate a little hard food in the mouth there are blood blisters may be traumatic blood blisters, mucosal pemphigoid, hemangioma, and so on. 1. traumatic blood blisters: may be due to eating harder food or larger pieces of food lead to choking injury, this choking injury is easy to cause blood blisters in the mouth. 2. Mucocutaneous pemphigoid: Mucocutaneous pemphigoid is an autoimmune disease. Blood blisters may occur, usually in the friction area. 3. Hemangioma: Hemangiomas, such as vascular malformations, may also appear as blood blisters. Female 69 years old recently ate a little hard food in the mouth on the blood blisters may also have other pathological factors, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.