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Lice are small, crawling insects that infest and feed on human hosts. Contrary to earlier speculation, the presence of lice does not indication a lack of good personal hygiene. Lice are spread through person-to-person contact, and if one member of a household becomes infested, lice can spread rapidly throughout the entire family. All types of lice can usually be controlled with over-the-counter treatments, but occasionally a prescription medication may be required.