Often, follicular cysts are found in a bimanual exam. If your ovary is enlarged by more than two inches, it will immediately be investigated. Your doctor will order a blood test to see how well your ovary is producing hormones. Then he or she will perform an ultrasound scan to see the size and composition of the ovary. In the United States, sometimes a CAT scan or MRI is done as well.
Follicular cysts are always benign.
The next step in treating follicular cysts depends on your age and the size of the cyst. If you're younger and the cyst is small, waiting it out may be the best course of action. However, since most follicular cysts resolve within one menstrual cycle, the first step is simply observation, eliminating the need for expensive tests and treatment. Most go away without rupturing, but these cysts may also rupture on their own. In either case, your menstrual cycle will get back in sync and return to normal.