I have pain at the top of my vagina like where hair is when i close my thighs together. could it be because i am on my period? it's on my left sd.

Pelvic pain: Menstrual symptoms don't usually affect the external female structures, but anything is possible. Other possibilities may be an ingrown hair causing a small abscess to start. Or you may have a blocked sweat/oil duct causing swelling. These can become quite large and sometimes require drainage. Try soaking it for 20 min 2x/day, and go see a dr if getting worse or if fevers or drainage.