If you have a blood blister on your tongue, do not pick it with a needle or your hand, as this may lead to a secondary infection of the blister. The formation of blood blisters is due to trauma, such as bites, burns and the formation of localized stress reaction, under normal circumstances, even if not treated for about a week, it will heal on its own. If the patient feels pain in the blood blisters, you can spray watermelon cream or anti-inflammatory drugs to make the blood blisters anti-inflammatory in time, which can promote its healing. But if you use a needle to release the blood from the blisters, because our needles are not sterilized, it is easy to cause infection of the blisters, resulting in a larger and larger wound. Blood blister is not a disease in itself, it is just a kind of trauma, because the mucous membrane on the surface is not broken, and the blood blister is caused by the internal trauma and bleeding.