Blood blisters on the tongue: a. It may be caused by the stimulation of trauma, do not use a needle to pick it out, because the needle at home is not strictly sterilized and may not be very clean, if you use it to pick out the blood blisters it is likely that infection will occur. You can crush vitamin B2 or triphala tablets plus borax, then apply the medicine externally to promote the healing of the blood blisters on the tongue. Second, it may be due to a lack of vitamin B in the body, especially vitamin B2, which may also lead to blood blisters on the tongue. You can take medications such as vitamin B complex tablets, spray watermelon cream spray locally, and eat turtle paste, carrots, grapefruit, bitter melon, cucumber and other lower fire foods.