To treat, parents can use an over-the-counter product with permethrin (Nix), pyrethrin (Rid), or spinosad (Natroba). Lice kits usually contain a special shampoo that is left on the hair for 10 minutes and then washed out. A fine-toothed comb is then used to remove any remaining eggs. Another treatment is a lotion called Sklice, which doesn’t use a comb. One treatment may be all that's needed. The key ingredient is ivermectin, a powerful parasite killer. You can use it on kids as young as six months.