I had mine removed in HKL when I was 12.

About 1 day after the operation I had fever. The doctor suspected infection so he opened 2 stitches and the wound was filled with pus. They put me on intensive antibiotic course and cleaned the wound every 2 or 3 hours. I had to stay in hospital for more than 1 week.

The wound didn't fully close until more than 1 month later.