Thanks for asking the query,
According to your clinical symptoms i suppose that you have developed infection in your tooth that had spread to the periapical tisssue leading to abscess formation, it can be a gingival abscess
or a periodontal abscess
to rule out this an x-ray is required.
I would suggest you to visit the Dentist
and get the checkup done take an x-ray of the tooth.
If it is gingival infection you have to go for complete mouth scaling, polishing and curettage.
If tooth related you have to go for root canal treatment
of the tooth.
Hope this helps out.