Final answer:
The most likely diagnosis for a patient presenting with acute swelling and pain in the cheek that increases at meals is mumps.
Step-by-step explanation:
The most likely diagnosis for a patient presenting with acute swelling and pain in the cheek that increases at meals is mumps. Mumps is a viral infection that causes enlargement and inflammation of the parotid glands, which are the salivary glands located between the ears and the jaw. Symptoms of mumps include fever, throat pain, and swelling of the parotid glands. It is important for the patient to seek medical attention for diagnosis and appropriate treatment.