hello and welcome to HCM forum,
I would like you to know that pain in the cheek is following accidental biting on the cheek while chewing food or biting on something hard.
sometimes, inside of the cheek gets trapped between upper and lower teeth causing severe pain
I advise you to see a dentist
in order to rule out the cause,
dentist will prescribe a you a gel(dologel-CT) to be applied on the concerned area.
also, perform warm saline rinses(3-4 times/day),
i hope i answered your query,
i wish you good health.