Dear Kerry
thank you for your question.
First of all , I would say that your concerns do not make me think of oavrian cancer.
However here are a few thoughts for you top take back to your doctor:
The groin area drains the foot , leg, and genital region (the vulva and lower third of the vagina)
so if you stub your toe and get some inflammation in the toe nail bed, your immune cells will work to clear the infection and drain into the groin lymph nodes which may get swollen
If you have an infection in the vulvar are, the same thing can happen. So if you have a blocked hair follicle or sebacceous cyst that then gets inflamed, you will see this. Or if you shave in the pubic hair, you can get nicks and irriatations that cause swelling of your groin lymph nodes.
However, you can also have swelling of the lymph nodes if you have a sexually transmitted infection. The most common would be herpes simplex
there are rarer other ones such as syphillis and very rare ones such as chancroid, lymphovenrereum
here is a summary from http://www.answers.com/topic/lymphogranuloma-venereum
Lymphogranuloma venereum (LGV) is a sexually transmitted systemic disease (STD) caused by a parasitic organism closely related to certain types of bacteria. It affects the lymph nodes and rectal area, as well as the genitals, in humans. The name comes from two Latin words that mean a swelling of granulation tissue in the lymph nodes resulting from sexual intercourse. Granulation tissue is tissue that forms during wound or ulcer healing that has a rough or lumpy surface.
Finally you have have a hernia in that site
and very rarely at your age, you can can a cancer of the lymph nodes
So you should talk with your doctor about screening for STDs,
you need a physical exam including a pelivc exam and palpation of the groin are
ask your doctor to check for a hernia
best wishes
Thankyou for your reply i have been screened in the last 6 months for all infections due to irregular bleeding and they all came back clear.I will however go back to the doctor for more info and tests.I am gratefull for your reply.
Thankyou again Kerry.