I agree that cysts are different during the monthly cycle. Many women have them and they are painful. If a biospy amd aspiration was done, I am sure it was sent for pathology tests. They must have come back negative. My question is why in the world would you have waited four months to go back when it was suggested six weeks? If it bothers you make another appointment to see your doctor. Be sure to have an annual well women's check, too. Take care of yourself.