1st consult with your concerned physician.
If possible attach a pic of lower last tooth of swelled up side of face.
Luke warm water gargle with a pinch of black salt a few times/day, only if it is not worsening the intensity of pain.
T.calpol 650, would help to reduce the symptom.
Ice pack gentle pressure over swelled up region on face extraorally.
Next Steps
avoid hot compress, ointment or balm application extraorally.