Welcome to heathcare Magic!
The bite has got infected and an abscess
has formed inside.
As a rule healing is better if the pus collection is drained.
Either surgically by your doctor or spontaneously.
The antibiotics would be more effective once you get the pus drained.
You should get tetanus immunization
if you did not receive the last shotwithinlast 5years.
Wish you a great health!