I just noticed a hard mass on top of her gum line right over here front baby tooth. It's hard like a tooth. At 1st I thought that she scraped her gun so deep that I could now see her tooth. However I noticed my daughters adult tooth sticking out under her loose baby tooth. I'm even more confused now bc I don't think that could be a tooth on the inner lining of her gum line. She says it isn't painful. She is only 7 any guesses as to what it can be? The hard mass is an off white slightly gray color and is in the inner portion of her mouth by the cupid's bow.