If there are misaligned teeth in the mouth, as well as overly sharp cusps, root remnants and crown remnants, which often scrape or bite the mucous membrane of the lateral edge of the tongue, it is easy to cause blisters or even blood blisters on the side of the tongue. When this symptom occurs, the dental problem should be treated promptly by sharpening the sharp tooth tips, treating the residual roots and crowns, and removing the local irritants. If the blister is small, it can be left untreated and absorbed on its own, but do not eat spicy or irritating foods. If the blister or bloody blister is large and the foreign body sensation is obvious you can go to the hospital to discharge the pus, blood and exudate under strict sterilization by the doctor. Blisters next to the tongue may also be caused by herpetic stomatitis, a disease that forms small pinhead-sized blisters that require treatment with antiviral medications.