Hi and welcome to Healthcare magic.Thank you for the query.
It should be treated there is radiological confirmation that there is no abscess
anymore. antibiotic commonly arent enough for full recovery and you should cosult doctor who can perform percutaneous drainage
if there is no improvement on antibiotic th. Such abscesses can cause serious consequances so it must be treated aggresively,even by open surgical procedure,sometimes.
Wish you good health. Regards