hello and welcome,
this is due to heavy calculus and plaque deposition on the lingual side of lower front teeth.
this occurs due to increased mucous content in saliva.
there is gingivitis
formation resulting in inflammation of gums.
visit your dentist
and get it checked clinically.
get deep scaling and root planning done by your dentist.
the absess has to be drained out by curettage using gracey curettes.
use soft-interdental toothbrush and dental floss to clean your teeth.rinse your mouth after every meals.
mouthrinse twice daily.
always brush in all aspects of teeth.ie,buccally,lingually,occlusally,incisally,
your gums using gum tone gel.
take tab.doxycycline-100 mg once daily for 7 days to make your gums intact,firm and resilient.