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Hi there -
There sre many possible explanations for your symptoms. But if you feel pressure in your jaw muscle it is possible you've got muscular issue - possibly a spasm of sorts in your masseter muscle (the cheek area muscle primarily involved in closing your mouth. If your cheek muscle feels unusually hard or stiff, this is certainly diagnostic. This may be related to recent trauma, possibly due to excessive biting force - either while eating, during activity, or bruxing (grinding your teeth) while sleeping. This condition may be indicative of Temperomandibular Dysfunction (TMD). As a precaution, it would probably be wise to have a soft diet and avoid biting on anything hard. Also avoid opening your mouth excessively.
It is also possible that you have an infection, although this is more typically accompanied by pain and heat in the affected area. Another possibility is a blocked Parotid (saliva) duct.
In any event, a visit to your dentist is advisable
Hope this helps - and please let me know if you've got additional questions. I'm here to help.