Mucous cysts develop when salivary glands become plugged. They’re usually temporary, but if left untreated, they can become permanent. A mucous cyst, also known as a mucocele, is a fluid-filled ...

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 ...