Swollen lower jaw right side below the ear, just started yesterday i wonder hwat is wrong, never had this before no?

Infection?: It could be that either you have a dental abscess or have a wisdom tooth trying to come in and it could be causing some issues in that area. It might also be a number of issues related to your ears or your teeth or any of the many stuctures in that area. You need to see a dentist or possible an ear nose & throat specialist as soon as you can.

Not normal: Jaw swelling is usually accompanied by pain and is a sign of a deeper problem. Call your dentist and have it evaluated. If it is dental related, it can progress to become a significantly painful, progressive, and dangerous swelling. Antibiotics tend not to cure these, but a skilled dentist will diagnose and address the underlying causes.