hi and welcome,
is the extreme painful condition where the alveolar bone is inflammed and exposed to oral environment due to dislodgement of blood clot post extraction . This can be treated by flushing the extraction socket with an antiseptic mouth wash like betadine or chlorhexidine
to remove all the infected debris, food particles or other remnants. fresh blood is then induced in the socket .
Extraction socket is then packed with a dressing of zinc oxide
eugenol pack or gauze which is replaced in position every 2 days till the symptoms of subside.
This all is done professionally by a dentist
, so i suggest you to visit a dentist for clinical examination.
Mean time you can try the above process at home by keeping the socket clean by mouth rinsing and application of pack. you can start with antibiotic and analgesic