I have gone through the description provided by you and would help you out.
If its size is decreasing it could be the blister because of hot food.
Is it bleeding or getting pain?
If it is accompanied with bleeding it can be gingival or periodontal problem.
( related to gums and tissues surrounding tooth)
If it is accopanied with pain along with bleeding or pus then it could be a gum abscess and if the teeth are seems to loose then it could be periodontal abscess
If the teeth are carious in that region then it can be draining sinus.
so the conformation can be given on checking the region.
Best advice would be consult with the dentist
Until then you can do following thing :
1) use mouthwash like chlorhexidine
to keep the mouth clean
2) If it is paining you can use topical anesthetic
gels like lidocaine
to get relief from pain.
3) you have to take antibiotics if it is an abscess. Dentist need to check first and would plan the treatment.
ope you find the discussion helpful.
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