In most cases, your doctor discovers that you have nabothian cysts during a routine gynecological exam. They almost always are considered to be normal.
Rarely, when there is something unusual about the cyst's size or appearance, your doctor may do a procedure called a colposcopy, which uses a magnifying instrument to examine the surface of the cervix closely. If the cyst looks abnormal during this exam, your doctor may do a biopsy to check for rare forms of mucus-producing cancer. In a biopsy, a small piece of tissue from the cervix is removed and examined in a laboratory.