What is this soft grayish bump on my gum-line where my recently placed dental bridge is located? (Photos)

I had a temp. bridge placed on 01/24/19 and then my permanent placed on 03/21/19. The dentist had many excuses for the long wait including the lab lost my bridge or the bridge was delivered to a person home by mistake. Recently, my tongue started to rub against a small raised bump. The bridge is located bottom left in the back. I have no pain or discomfort at this time. I do not want to go back to this particular dentist because he was not professional at all. Can I treat this at home?