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Written for dermatologists by dermatologists. Indexed by the US National Library of Medicine.
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Lice - Patient's guide  

Lice Treatment Problems and Failure

People sometimes think that lice are not responding to treatment. Some common problems are:

  • Misdiagnosis – the person does not actually have lice
  • Insufficient quantity of treatment or medication
  • Treatment not applied correctly -such as used on wet hair
  • Reinfestation