About a week after the Rindone family returned from their tropical summer vacation, 7-year-old Andrew started complaining about a bump on his head. "It did hurt a little," Andrew said. "And, it did itch." The boy's pediatrician thought he had an infection and prescribed antibiotics. But the bump just kept getting bigger, and a small pinhole began to appear. Then one day, Andrew was on the couch when his mother saw something that horrified her. "We kind of noticed something peek out of the hole," Jennifer Rindone said. The small opening was apparently a breathing hole for the larvae growing...