pain?

So I was fine all day, and have no problems going on that I know of. But I got home and showered - I used my normal routine which includes Summer's eve Delicate Blossom feminine wash - and since then I have felt a burning sort of pain on the outside of my vagina. On the surface, nothing interior. It has calmed down a bit now but is still uncomfortable. It really hurt for a while. Has anyone else experienced this, and do you know what could have caused it?