What Causes Redness And Tenderness In Labia Minora During Intercourse?

Am a 44 year approx 5' 10" 140 lb woman. I was a virgin until about a month ago. My Labia Minora is tender to the touch during foreplay and intercourse and found there is some minor redness in that area. this has existed from the start. Other than clothing or irritation causing this condition, is there anything else that could be the cause?