I recently suffered with tonsillitis for more than a week and then as soon as that got over, I had to go and get my root stumps extracted because I had extremely tender gums. And now it seems my ordeal is far from over, as soon I have any food which is even slightly spicy I can literally feel a blister forming in my mouth. Yesterday night I had a burger which was slightly spicy and I felt a sore area and almost like a blister kind of thing forming behind my maxillary molars, but that was gone by today morning. Today night I had some fish gravy prepared at home and as soon as I had two mouthfuls I felt a blister forming and getting enlarged below my tongue near the attachment between the tongue and mouth. I had the same gravy earlier in the afternoon but felt nothing. Now this blister is extremely painful and it's difficult for me to even talk. Why is this happening?