If it’s a cyst, it is a small sac filled with air, fluid, or other material. A tumor refers to any unusual area of extra tissue. Benign tumors tend to stay in one place, while malignant tumors ...
A mucous cyst develops when the mouth’s salivary glands become plugged with mucus. While they’re usually temporary and painless, they can become permanent if not treated. What are mucous cysts?