Clinical Definition Lice are blood-sucking parasites, known as Pediculus humanus capitis if on the head; Pthirus pubic if in the pubic area; andPediculus humanus corporis if elsewhere on the body. Infestations are typically the result of close person-to-person contact. Incapable of flying or hopping, the parasitic insects must crawl instead. Treatments with prescription or over-the-counter remedies can quell infestations. In…