Hello, Welcome Thanks for consulting HCM,
I have gone through your query, as you have pain in eat under jaw dont worry it can be due to Temporomandibular disorder (
TMJ Joint ) pain, or due to infection in some other tooth causing pain.
You do warm saline gargle two - three times a day.
Do Hot formentation twice daily for painful area near ear.
Apply ointment Relaxyl gel or gel containing
Diclofenac sodium twice daily tropically.
Take one tablet MYOSPAZ forte once daily by consulting your
dentist for one week .
One tablet vitamin B complex once daily for 7 days.
And consult your dentist for oral examination of there is infection in any tooth then go for restoration and scaling done.
Hope this will help you.
Wishing you good health.