Well I saw my dentist today. He looked at it and said it looked like it was just the bone/tooth sticking out and had always probably been there (normal anatomy). He said it was possible I could have scraped my gum a bit from brushing but he doubted that was it, just looked to him like white from the bone being seen through the gum.

I'm still going to keep an eye on it to make sure it doesn't grow. Thanks for the responses. Don't know if I should have made him biopsy it or if I'm just being ridiculous/paranoid. He's a Dentist and I'm sure if he thought it was possibly anything more he would have said so. He is pretty thorough.