i had small spot on top gum which popped when i touched it. I had a dentist appointment so told her but she didn't seem concerned just said keep an eye on it. 4 months later and it has come up few times more but not as big as i put my nail on it and it goes away. i went back to my dentist as bit concerned so she took an xray. she said there is nothing there. i am really concerned can anyone help?