The swelling could be because of any impounding infection in that area. Warm water salt gargles 3-4 times/day for 7 days is the recommended line of procedure in case the swelling is superficial and reversible. If not receding in a week, please visit nearby dentist or feel free to consult me if you are in Bangalore for further diagnosis.
Next Steps
Warm water salt gargles - 3 times/day for 7 days
Health Tips
If not subsiding, please visit your nearby dentist and get it resolved.