SUPER Bad Blister!! OW!!?

I have this blister in my mouth and its like in front of my bottom teeth right below the gums and it hurts so badly.... it hurts when i talk eat and everything! Its white and its really small like the size of a bead, but it hurts so badly... can you help please!! What can i pout on it... ive been putting campho phenique on it but it stil hurts i woke up with it yesterday and it only keeps hurting more and more... HELP PLEASE