Oral mucous cysts develop in the mouth. They appear near salivary gland openings, often on the lips or the floor of the mouth. A cyst on the floor of the mouth is known as a ranula. A cyst on the gums ...

Those who have a habit of biting their lips may find that a small bluish bump has developed inside their mouth. It might disappear on its own or it might linger. Dr. Zaineb Hassan Makhzoumi, an ...