Hailey Bieber said she has been diagnosed with two ovarian cysts after giving birth to her and husband Justin Bieber's son ...

A cyst is a sac of tissue that is filled with another substance, such as air or fluid. Tumors are solid masses of tissue. Cysts can feel tender to the touch, and a person may be able to move one ...

Read on to learn more about ingrown hair cysts, including what causes them, how to identify them, what treatments may help, and more. When an individual hair grows into the skin, a fluid-filled ...