We had to take Charlie back up to the vet yesterday. His abscess had gotten larger than it was before, and didn't seem the antibiotic they gave us was working. They drew more fluid out, less puss this time, mostly plasma. The doctor told us it was about 50% better but is still concerned about the condition so she sent a sample to the lab to find out what the problem is. Will take about 8 days until the results come back. In the mean time he's back on another antibiotic and a pro biotic.