What are the physical findings of body lice in pediculosis and pthiriasis (lice infestation)?

Updated: Mar 01, 2018
  • Author: Lyn C C Guenther, MD, FRCPC, FAAD; Chief Editor: Michael Stuart Bronze, MD  more...
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Answer

Physical examination findings in body louse infestation include multiple lesions from bites. Uninfected bites present as erythematous papules, 2-4 mm in diameter, with an erythematous base. Bites may be located anywhere on the body but tend to be concentrated in the axillae, groin, and trunk (ie, areas most often covered by clothing). Thus, the face, feet, and arms are not commonly affected. Body lice tend to avoid the scalp, except at the margins.


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