Tampon infection?

I always wear pads, but this time i decided to wear a tampon. I wore it for a few hours (not sure how many) but when i took it out, no blood was on it. (My period was already ending anyways). But it was really really wet from the discharge i think. I didnt think much of it, but the next day, my area started feeling itchy, i know its not a UTI because this time it felt super different. It didnt hurt, but i can feel it being numb or something. And when i touch it, i also get that feeling of scratching it. So i decided to peek down there and i saw white stuff. (I assume its from the tampon). So i decided to take it out with my clean fingers until i saw no more. What is this? I am sexually active but i dont think that has anything to do with it.