Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain it seems that the blisters at the back of tongue are inflamed Circumvallate papillae that contains
taste buds and they can bet inflamed due to reasons like
throat infection, oral infection, allergies, burning with hot foods and chemicals like concentrated mouthwash solution,
post nasal drip etc..
I would suggest you to do warm saline gargles.
Soda bicarb gargles can help..
Take
Ibuprofen to reduce inflammation and pain.
Gargle with a numbing mouthwash containing Lignocaine..
Avoid hot and spicy food..
Drink plenty of cool water and suck ice..
In case of no improvement consult an Oral Physician and get evaluated..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.