Lice on the lower body refers to pubic lice disease, which is caused by infection with pubic lice. Pubic lice disease is a kind of lice disease, which is a contagious disease caused by pubic lice parasitized on body hairs around the vulva and anus of human body to bite the skin and cause itching. In addition to parasitizing on the vulva and perianal body hair, pubic lice can also parasitize on eyebrows, armpit hair, etc. They feed on blood, and their eggs adhere to the pubic hair and suck blood by piercing the skin through their mouthparts, which causes intense itching at the parasitized area, which is especially heavy at night. Erythema or papules may appear on the skin after biting, as well as scratches and breakouts caused by itching. Pubic lice disease should go to the hospital in time for standardized treatment to prevent spreading to others. In daily life, it is necessary to pay attention to maintaining good hygiene habits, eliminating sexual promiscuity and not contacting unclean household products.