My son first developed AU within 3 months of starting Pre-Kindergarten at our elementary school.  it continued through the 4th grade.  In 5th grade they go to another school and that school had mobile classrooms that were built in 2000.  His hair started coming back and by the time he entered the Middle School for 6th grade he had all of his hair back.  for 6th, 7th, and 8th grades in the middle school he never had a problem.  The middle school was built in 1997. 

Then…