A patient with a removable partial denture (RPD) complains of a burning sensation under the bridge near the mandibular buccal premolar area. What is the likely cause?

The mental foramen/mental nerve exits in the premolar region of the mandible, and an RPD framework or denture base that places excessive pressure directly over this area can compress the mental nerve, causing burning/paresthesia-like discomfort localized to that specific anatomic region — fitting the scenario described better than a generalized allergy or rough-surface irritation, which would not be so anatomically localized to that nerve's exit point.