The Crab Louse, scientifically known as *Pthirus pubis*, is a small parasitic insect that primarily infests human hair, particularly in the pubic region. It is a type of louse that feeds on blood, causing itching and discomfort. Crab lice are typically transmitted through close physical contact, often during sexual activity, but can also spread through infested clothing or bedding. Crab lice are easily identifiable due to their crab-like appearance, with a broad body and short legs. They are usually light brown or grayish in color. Treatment for an infestation often involves over-the-counter topical insecticides and thorough cleaning of personal items to prevent re-infestation.