How can I tell if my chin implant infection has resolved with antibiotics? (photo)

3.5 weeks post-op chin implant redness appeared around the incision. Surgeon said it's infected but wasn't clear if it was the incision or the implant. I've been on amoxcillin for 3 days (dosages approx. 5 hours apart), and the redness hasn't changed. How will I know if the infection is of the implant or incision, and whether it has been resolved by antibiotics? And how long would this usually take?