Thank you for your query,
Your child seems to have middle ear infection
with pus dicharge.
Continue the medication ad advised by his Pediatrician
You can clean the discherge out dise the ear.
Avoid entering of the water into ear while taking bathing.
If the infection is not responding to the antibiotic, the pus should be sent for culture and sensitivity to find out the organism and its sensitivity to antibiotics so that appropriate antiviotic can be started.
So consult again your Pediatrician for further advise.
Hope I have answered your query.