Hello,
It may be a canker sore. Regardless of what it may be, I strongly suggest that you do not "pop" it, as this would cause pain, irriation, take longer to heal and possibly cause an infection.
I would avoid spicy or any irritating foods like citrus and carbonated drinks. Rinse the area with warm salt water a few times a day, especially after meals. Avoid touching it with your tongue.
If this does not heal with the next five days, or it becomes larger, I would suggest that you make an appointment with an ENT (ear, nose & throat) specialist. This is the type of specialist best suited to examing this type of lesion and providing any treatment deemed necessary.
Do you smoke?
Here is some info, let me know if you have questions:
http://www.mayoclinic.com/health/canker-sore/DS00354/DSECTION=2
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