I have what looks like blisters on the back of my toung. and my throat slightly hurts. they are red. with a slight white coating on my toung.

Sore throat: Sounds like a viral illness, but see your doctor for a throat culture to rule out strep.

Clean, rinse.: Some of this lesions are temporary and go away if you clean and use antibiotic rinses (mouth wash). Could be fungus infection needing anti fungal medicine. Wait some 7 days and consult a dentist or a ENT specialist. Remember to brush (scrape) your tongue for a better result.