Mucus cysts form on the surface in a thin bag containing clear liquid lip. Mucous cyst is a common disease. This mucus is sometimes painless, but can be disturbing because it realizes a lump in the mouth.
Mucous cysts are harmless. But if not treated can form a permanent bump on the surface of the lip. These bumps are called ranula when they appear on the floor of the mouth, and epulis when on the gums.
Appeared thin fluid-filled sac appears on the inside lip. Sac is bluish and clear. Pouch does not cause pain, but annoying. Pouch can also occur on the tongue, palate, inside the cheek, floor of mouth, or around tongue or lip piercings.
Mucus cyst usually will rupture spontaneously. Opening the top of the bag with a sterile needle will help the loss of these bags. If the cyst comes back, need to be removed medically.