I quite agree with the above.
Abscesses are likely to heal themselves if given either drainage or antibiotics.
If giving both, then they have the best possible shot.
Ideally a dilute iodine/hibiscrub solution flushed in with the tip of a syringe (without needle attached) is the best way to get all the pus and nasties out.
Pen/strep is great for the usual abscess bugs.
Should go down over the next wee while if you keep going like that
Suzanne