Blisters in the mouth are a common disease caused by germs.
Candida albicans are born inside the mouth. These white worms are the living creatures of the universe that are found in the mouths of human beings but sometimes they cause some diseases.
According to an article published in the journal Sydney, blisters form on the inside of the mouth, mostly on the inside of the tongue and cheeks. They sometimes form on the upper part of the mouth and on the gums.