Louse (Head, Body, or Pubic Louse)

Human body hair (scalp, eyebrows, chest) or clothing/bedding in close contact with humans

Obligate hematophagous ectoparasites that feed exclusively on human blood

They are wingless and crawl between hosts via direct contact; they lay eggs (nits) that glue firmly to hair shafts or clothing fibers

Risks include intense itching, skin irritation, and secondary bacterial infections from scratching. Body lice can transmit diseases like epidemic typhus. No known benefits.