What are the physical findings characteristic of pediculosis (lice infestation)?

Updated: Aug 16, 2019
  • Author: Lyn C C Guenther, MD, FRCPC, FAAD; Chief Editor: Michael Stuart Bronze, MD  more...
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Manifestations of head louse infestation include scalp pruritus and, rarely, occipital lymphadenopathy and impetigo. Examination of the scalp reveals excoriations, dark specks of louse feces, nits, and adult lice. The heaviest infestation typically is in the retroauricular scalp. [4, 11] For the diagnosis of P capitis infestation, the use of a louse comb is more efficient than direct visual examination of the scalp. [27]

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