Hi, I Have A Painful White Line On The Inside

Hi, I have a painful white line on the inside of my upper lip. It is raised just a little and completely white. I can feel it with my tongue and fingers. It hurts mostly when I move my mouth or put any amount of pressure. So while brushing hurts tremendously. I'm not sure what to make of this as I have changed my diet recently. I have stopped drinking soda and drink mostly water, 100% fruit smoothies, and fresh lemon water daily. What is your opinion?