Mites are the root cause of scabies. The mites burrow into the skin and lay eggs, causing intense itching. All of them lay eggs that look like white grains attached to hairs. And of course, all of them cause intense itching. Schoolchildren often become infested without knowing how.
Treatment is reasonably easy, but somewhat unpleasant.
The treatments are really insecticides that kill the adult insects as well as their eggs. Note that you must treat everyone in the family, not just the people displaying symptoms of infestation. If you have scabies, you will apply a lotion to your whole body except your head and neck. Take a shower before applying the lotion. The lotions are messy, and should not be washed off for at least 8 to 12 hours.