Aspects of this topic are discussed in the following places at Britannica.
any of several stereoisomers of 1,2,3,4,5,6-hexachlorocyclohexane formed by the light-induced addition of chlorine to benzene. One of these isomers is an insecticide called lindane, or Gammexane.
...Effective treatment consists of covering the affected person from neck to feet with medicinal lotion that kills the mite. Several medications are available. One percent lindane lotion (gamma-benzene hexachloride) is effective but can be toxic. Permethrin, a synthetic drug based on chemicals derived from the chrysanthemum, is effective and quite safe, even in very young children....
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