Nipple piercing

So I read a story about this girl getting her nipples pierced and she had this “white string” coming out of the hole and she didn’t know what it was so she cuts it with scissors and it turns out to be a nerve. I just changed my horseshoes out and there was this stuff wrapped around the horseshoe I just put in. It kind of hurt to change and It kind of looked rubbery?? I’m slightly freaking out lol