Thanks for the question.
It's difficult to treat this on your own or without help of your doctor.
Recurrence with such abscesses are common and your friends needs to repeat antibiotic course along with complete drainage
of these abscesses.
This is the only way this can be treated.If it remains untreated, the infection might increase and even lead to complications like septicemia
So even though you are looking for home solution for this, I am afraid he will need doctor's help.