MedlinePlus states that a cyst is closed sac that is filled with air, pus, fluid or debris. An abscess is structurally similar to a cyst, but it is the result of an infection and filled with pus. More »

Treatment options for a gum abscess, also known as a gum boil, include rinsing the mouth with a saltwater solution, drainage of the pus by a dentist, antibiotic medications and painkillers, as listed by Colgate. Cleaning... More »

A pilonidal cyst is a growth on the bottom of the coccyx, or tailbone, according to WebMD. If the cyst develops an infection, it is known as a pilonidal abscess and can fill with pus. When it becomes an abscess, it resem... More » Health Conditions & Diseases Skin Conditions

A synovial cyst is a sac filled with fluid that develops on the spine as a result of spine degeneration, according to Consequently, it is not commonly seen with patients younger than 45. It is most ofte... More » Health Conditions & Diseases

A complex ovarian cyst is a sac containing both fluid and solid components that develops within or on the surface of the ovary. Complex cysts do not develop as a normal part of the menstrual cycle, according to Mayo Clin... More »

A cystic mass is a sac that is filled with fluid, air or other material; it can form anywhere in the body, including in the soft tissues, organs and bones, according to Mayo Clinic. Most cystic masses are benign, or nonc... More »

Staphylococcus bacteria, the leading cause of bacterial pneumonia, cause the lung’s air sacs to become inflamed and fill with fluid, pus and debris from cells, states Healthline. This causes the body to become impaired r... More » Health Conditions & Diseases