A clinical review in the British Medical Journal looks at an embarrassing problem some of your children may be facing: Head lice.
Although the study reviews scabies, it is very similar to lice and likely to work for it both.
Head lice -- also going by the moniker scabies -- is highly contagious and spreads through direct skin-to-skin contact. A patient with an "ordinary case" of head lice has an average of 12 mites on their bodies, but those suffering from crusted scabies may have millions of them. Outbreaks of head lice rise and fall cyclically, according to the report, peaking for unknown reasons every 15-25 years.