Hello,
It's been 20 days, and so you can stop using the ointment too. The small bump will slowly resolve..or in some cases it can remain. If it still remains,and you find it appearance wise disturbing,you can get it removed surgically. It's a minor procedure,where a small cut is made ,and the collection is drained.
Next Steps
If there is no pain, no need to continue the medications. Either you can just let it be, and watch if it goes down , or get it drained after a month.