The redness shown appears to be localized irritation of the buccal mucosa adjacent to the lower wisdom tooth. Given the history of repeated toothpick trauma and a cavity/food-trapping area near the wisdom tooth, traumatic irritation is a likely cause.
Next Steps
For now, avoid toothpicks and any further mechanical irritation of the area. Maintain gentle oral hygiene and rinse with warm salt water 2–3 times daily. Avoid tobacco, paan/gutkha and spicy or very hot foods while the area heals.
The underlying cavity and wisdom tooth should also be evaluated by a dentist, because continued food impaction or sharp tooth margins can keep traumatizing the mucosa. If the wisdom tooth is partially erupted/impacted and repeatedly causing problems, extraction may ultimately be recommended.
Health Tips
The important point is that a traumatic ulcer/irritation should show clear improvement after the source of trauma is removed, generally within 1–2 weeks. If the red/white patch persists beyond 2 weeks, becomes larger, develops an ulcer or lump, bleeds, becomes painful, or doesn’t heal despite stopping the irritation, it should be examined promptly by a dentist/oral medicine or oral surgery specialist—particularly given the previous tobacco/areca-nut exposure.