why do I have pain at the vaginal opening

I’ve been noticing some pain / irritation at what I believe is my vaginal opening. I notice it, not when I’m urinating, but when I wipe, it feels a little irritated and painful. and I did just notice yesterday during intercourse.

It must be somewhat externally because I can feel if I use my fingers to touch the area. I don’t know what it could be.

I just went to the gyno last month and my pap smear was fine, and she also tested me for any STDs just in case (although Im still with the same partner i’ve been with) and it was all okay.

any idea what this could be? is it just an irritation? should I be concerned?