Thanks for asking the query,
Pian in the mandibular region can be due to many factors like Temporomandibular joints disorders, cyst
osseous lessions, neurological disorders, pain in tooth and gums radiating in that area.
For this you need to visit to an Oral and Maxillofacial Surgeon and get a thorough checkup done.
Take an OPG X-RAY which will give the exact condition of alveolar bone, teeth in that region and jaw bone.
Take tab augmentin625mg twice and tab aceclofenac
twice for three days till you visit to the Dentist
Maintain a good oral hygiene
, use lukewarm saline gargles 3-4 times a day, use antiseptic mouthwash gargles twice daily.
Hope this helps.