Sometimes a diagnosis is as simple as seeing a louse crawling on the skin. However, doctors most often find body lice and eggs in the seams of an infected person’s clothing. The physician also looks for reddened areas on the skin, then determines whether the areas are due to a mite infestation, a viral eruption, or contact dermatitis. They will also check for evidence of co-infections, such as head lice, pubic lice, or fleas.

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