What causes blood blister inside the tongue?
Patient: Hello my boyfriend has just discovered what appears to be a blood blister on the underside of his tongue, it appeared this evening and he could feel it swelling for a couple hours. It has popped now, releasing a little blood, although it s still sore he hasnt had anymore problems. I was wondering if you could tell me what causes blood blisters? Doctor: Thanks for your query, I have gone through your query.The blood blister what you are describing can  be a hematoma secondary to any trauma to the floor of the mouth or tongue. It can be a ranula also. It is a cystic lesion occuring secondary to trauma to salivary glands. Nothing to be panic, consult a oral physician and get it evaluated. If it is a hematoma, nothing to worry, do hot and cold water rinse, do not traumatise that area. If it is a ranula consult a maxillofacial surgeon and get it excised.Do saline gargling. i hope my answer will help you, take care.