It couldn't hurt to see a gynecologist about this. Did you complete menopause? Any cyst that develops post-menopause should be investigated.
I would not be concerned, but, I would go to the gyn and have it checked....probably nothing. There is a great forum for Ovarian Cysts. There are many fabulous women over there that can probably offer more guidence and support regarding cysts. This forum is mainly about Ovarian Cancer.