This is Dr. David
this is most likely a blockage by a salivary stone blocking a salivary duct causing it to swell up
try using warm compresses on your cheeks and sucking on hard candy and lemon drops and drinking plenty of water to help push out the blocked stone.
in many cases this will work to help relieve the blocked saliva pressure
if it doesn't work, then you need to go see an ENT doctor about it
let me know if you have other questions.
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