When your scalp is itchy and white flakes are visible in your hair, you may wonder whether you have lice or dandruff. Their symptoms can overlap, making it hard to tell them apart. Head lice are ...

Head lice affect more than 100 million people worldwide annually. Permethrin (1% formulation) is efficacious but resistance is emerging. Malathion (0.5% formulation) is an alternative, but ...