Thank you for your query.
In my opinion you should continue with the course of the antibiotic. Hematoma
should not last for two weeks now. Hematomas start resolving within a week. On completion of the course of the antibiotic you should be observing that the swelling will be reducing in size though very gradually.
I hope I have answered your query to your satisfaction.
Wishing your son an early recovery.
Rajiv K Khandelwal