It’s a lump of fluid, air, or something else. Cysts are very common, and most aren’t cancer. You may need tests (like a CT scan, ultrasound, or biopsy) to confirm that it’s a cyst. They do ...

9. Mucoceles A pea-sized lump on the roof of your mouth could be a mucocele. Mucoceles are round, fluid-filled lesions usually 1 to 2 cm in diameter, dome-shaped, with a clear or bluish color. Most ...