Final answer:
The regional term for the cheek area where pressure is often felt during a sinus infection is 'Buccal'. Such infections are referred to as bacterial rhinosinusitis and can be caused by bacteria like S. pneumoniae, H. influenzae, and M. catarrhalis.
Step-by-step explanation:
When experiencing a sinus infection, many individuals report feeling pressure in their cheek area. The regional term for this area is Buccal. This sensation is related to a condition known as bacterial rhinosinusitis, which involves infection and inflammation within the paranasal sinuses. Often, these infections are secondary to viral infections which have compromised the immune system, allowing opportunistic bacteria like S. pneumoniae, H. influenzae, and M. catarrhalis to establish an infection.