Cyst is a closed sac. Cyst may contain air, fluids, or semi-solid material. A collection of pus is called an abscess, which is not a cyst. The cyst may need to be removed surgically, but that would depend upon its type and location.

  • Ganglion cyst ― Asymptomatic lumps that occur suddenly between joints. If the diagnosis of ganglion cyst is confirmed, the problem may be solved by pressing the nodule hard to burst the cyst inside.
  • Mucocele ― It appears as a soft bump on the lips without any symptoms.