Red slightly swollen spots at back of throat. doc said likely normal. now dry cough, starting to hurt, need to clear throat often. infection? cancer?

Sore throat.: If you are having continued sore throat, then you need to get in and have it evaluated. There are many possible causes.

Sore throat: Highly unlikely that its cancer. Swollen spots aren't normal. Most likely its an infection. Start off with OTC medications and gargle warm salt water. If not improving in a couple of days then follow up with your PCP.