Blister In Throat Pics For The Past Few Days, After I Eat My Throat Gets Sore, And A Small Blister Appears, What Could Cause This?

For the past few days, after i eat my throat gets sore, and a small blister appears, what could cause this? - blister in throat pics

I did not and do not eat food normally, or too salty or greasy or something. Just regular food. The lamp is in my lip, and the left side of the neck is what it does hurt. The pain disappeared after about half past one. Ideas? Thank you!