Hi doctor my 4year old son has a swollen cheek, with a bit of fever can i get advice on what could be the cause and treatment?

Swollen Cheek: The swelling could be from an infection associated with a carious primary tooth. Have a local pediatric dentist take a look and provide treatment if the cause is dentally related.

Fever/swelling: Sounds like an infected (abscessed) tooth. This can spread rapidly and create significant havoc. By for he should have a history of regular dental care for the last 3 years. Get him to the Dentist, or a pediatric dental specialist, a Pedodontist, immediately, before the swelling in his cheek (spreading infection) causes eye damage.