What is a cyst?

A sack of fluid: A cyst is a fluid filled sac that usually has a thin wall (capsule) and is filled with a watery fluid. Complex cysts may have multiple fluid sacs all bunched together. They are usually treated by drainage though often the capsule neds to be removed to prevent recurrence. Other cysts may have thicker contents. If it is filled with pus its usually referred to as an abscess. Hope that helps.

See your doctor: Cyst treatment depends on location, size, and likely recurrence. Often a biopsy is done to confirm that it is benign. Options include doing nothing, reducing or removing it. Reduction is done because it is too dangerous to remove. Benign cysts can be removed for cosmetic reasons or to prevent recurrence. If it presses on a body part and causes dysfunction, then it should be excised.