My son, 17, had a tympanomastoidectomy on Oct 27. Surgery lasted almost 5 hours. He was given antibiotics after. A week later antibiotics were changed because of infection of incision. It got better. Three weeks later, more antibiotics as onfection returned. Weeks later, it abscessed and he was hospitalized for two days with iv and oral antibiotics. Three weeks later, now today, infection is coming back????