Men with lice underneath, also known as pubic lice disease, are mostly considered to be related to factors such as inattention to personal hygiene and a history of contact with pubic lice. Pubic lice disease is an infectious parasitic disease, its occurrence is mostly related to direct contact with lice, spousal contact with lice or patients do not pay attention to personal hygiene, etc. After the onset of the disease, the patient will mostly find gray-white sand-like particles and active pubic lice at the pubic hair, accompanied by obvious itching of the skin, more so at night. For patients with pubic lice, once diagnosed should be treated as soon as possible, first of all need to remove the pubic hair, destroy the lice parasitic environment, for personal clothing, towels and other items need to be boiled and disinfected, if necessary, under the guidance of a doctor to use lindane lotion, malathion lotion, sulfur ointment and other active treatment, treatment should be prohibited during sexual life. For patients with pubic lice, it is recommended that they go to the dermatology department of a regular hospital for consultation and active treatment under the guidance of a doctor, and do not use medication on their own.