Welcome to health care magic forum.
The bump occurred at the right side of gums may be due to-periodontitis
or deep caries which has progressed into abscess
A thorough clinical evaluation by a dentist
will help to rule out the cause of occurrence of bumps.
The pus has to be drained and curretted well.
Tooth has to be root canal
treated if there is deep caries associated.
Get a thorough deep scaling done.
Hope this helps.