Hello,
I think a proper Incision and Drainage is required as there might be still some collection of pus which is mediating these inflammatory reactions. Switching to antibiotics wouldn't help much as a thorough drainage of pus is required. Even color of pus is not be examined to know the nature of organism and then we need to select an antibiotics accordingly
Next Steps
I would suggest you to go for medical drainage of pus by your doctor and then a coverage of an antibiotics can be given