Gingivitis is bleeding and swollen gums … for that visit ur dentist get cleaning done … you can take
vitamin C supplements.. but need to know the exact cause… You can use antiseptic analgesic gel after consulting your dentist because exact cause , site size any history of fever everything needs to be known and frequency or any systemic disease which can cause this …
Next Steps
visit your dentist, maintain good oral hygiene keep your self hydrated