Hello and welcome to HCM,
The tooth you have got extracted was infected with abscess
draining to underlying tissues .reoccurence of pus shows that there are remnants of tooth like root pieces left back or the socket was not curreted and flushed properly after extraction. visit a dentist
and check for the above things and get the abscess drained and curreted nicely followed by a pressure gauze. you need an antibiotic course of augmentin
and NSAID's for 3 days and mouth rinsing with antiseptic mouth wash like betadine
. i hope that helps, take care.