Hi and thanks for using this panel too get answers to your health query. These cysts are small and fit the definition of functional cysts. They need monitoring to make sure they disappear after a while and not row into any other concerning lesions. They should not really cause any problems to you because so many women out there have this same small cysts.. Feeling your breast tender after menstruation is not common but by itself constitutes no big abnormality. you shouldn t get worried by this. For now, keep calm. Observe and follow up with your OBGYN in about 3months unless something else comes up in the interim. I Hope you find this information helpful. I wish you good health and please feel free to return with mores questions andd request for more information. Dr. Ditah, MD.