Hi Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern...
You might have any of following condition
1.Dental/periodontal abscess- is a localized collection of pus associated with a tooth or gum. They occur when a localized infection of tooth spread to gums & nearby soft tissues.
2.pericornitis- which is inflammation of the soft tissues surrounding the crown of a partially erupted tooth, including the gums.
Following remedies can be tried
1. Anti inflammatory drugs like ibuprufen/
acetaminophen can be taken to reduce swelling.
2. Salt Water Gargle-Mix 1 tsp of salt with warm water in a glass. Gargle for roughly 15-20 seconds and spit out. You can repeat this as needed for 2-3 days. Remember to spit the water rather swallowing it.
Visit your dental surgeon he will do a x-ray to confirm the cause & give you a specific diagnosis.
Hoping your query is solved
Get well soon.