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21.3 Patchy Redness and Pimple-Like Conditions -- Part 5
If there are many treatments for a condition, it's probably because they aren't really good.
The first-choice treatment is usually nonprescrip tion medications, but resistance has become common.
malathion and lindane are both banned in some areas, but other prepara tions containing them are also available.
Sometimes a single-dose treatment with ivermectin is used.
LiceMD is effective and safe.
It is usually diagnosed by examining the skin scrap ings and treated with permethrin.
Sometimes difficult cases are treated with oral ivermectin.
Middle- and upper-class school children in the United States are more likely to experience an outbreak of head lice than the public is aware.
Children who know each other well and head-to-head contact are some of the reasons why head lice are easily trans ferred by parents.
Epidemic typhus can be spread by the body louse.
The victim is often unaware of these silent passengers until they itch, which is a result of sensi tization to louse saliva.
Secondary bacterial infections can result from scratching.
They hatch in about a week.
Young stages of the louse are called nits, and this egg case contains the nymphal stage.
Egg cases are leaving through the cap.
They don't necessarily indicate by gulping air and forcing it out of the anus until it pops free.
At the rate of champagne cork.
The attached nit moves away from the head.
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