Hello,
Without examination,confirming a diagnosis is tough but the various possibilities for your symptoms are infections(esp bacterial vaginosis),trauma,allergies,muscle strain of the inner thigh muscles,urinary infections and sciatica(pain due to the compression of the sciatic nerve).
Apply warm compresses on the inside of the thish and take some anti-inflammatory pain killer like ibuprofen.Also do some stretching exercises and yoga and maintain a correct upright posture while sitting.
If still the symptoms persist,then the above possibilities have to be probed.In that case,an examination by a gynecologist will be the best.
I hope that helps. Please do keep me posted if you have any additional queries. Kind regards.
Have you been check for endometriosis. That is were the a cycst my grow into the overy and that over that overy and my need to be removed.