For pediculosis, it should be left in place for 6 to 12 h before being washed off. Nits and lice can be mechanically removed with a comb in most cases. Resistance to permethrin is increasing. Keratolytic shampoos containing salicylic acid may be useful adjuncts in the management of pediculosis capitis. Petrolatum applications may kill or weaken the lice on eyelashes.
Recurrence is common.
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