Head lice are mostly infected by direct human-to-human contact, either as adults or from eggs that hatch into waking worms and then into adults. Human head lice parasitize the hairy part of a person’s head and lay eggs at the roots of the hair. The eggs are oval and creamy white, and the female lays them by secreting a gelatinous liquid that causes the eggs to adhere to the hair or clothing fibers. It is more easily transmitted when the patient is in close contact with healthy people, such as sharing combs and hats. Eggs hatch in 7~8 days, and the shape of the worm is similar to that of the adult, with a smaller body, especially the abdomen is shorter. The development time of the worm takes 8~9 days. Adults can mate in 12 hours after feathering, and can lay eggs in 1~3 days, which is the process of head lice production. Therefore, it is necessary to change clothes, bedding and wash hair diligently to prevent the growth of head lice. For head lice patients can shave off their hair and use diclofenac permethrin to apply to the hair to kill lice as prescribed by the doctor.