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 ...

An oral mucous cyst, also called a mucocele, is a harmless swollen spot. It's a good idea to get it checked out, though, especially if it's bothersome. There are two types. Mucoceles show up on the ...