What Causes Blisters In Throat?

My name is Tracy Sullivan. I am 42 years old and just recently had strep throat with lots of blusters in the back of my throat. I have been on Amoxicillin since January 28th. I still have yellow patches on the left side of my throat. I don t have fever anymore and feel better. Don t know if this is normal or not. I don t want to make something of nothing, but really starting to get concern. To be honest I m concerned because I m afraid it could be throat cancer.