Recurrence of pubic lice one month after recovery from treatment requires re-treatment. The recurrence of pubic lice after treatment may be due to the fact that pubic lice are not thoroughly treated, not treated by husband and wife together, and re-infected. Pubic lice are parasites that live in the skin of pubic hair in the genital area of men and women as well as in the skin of body hair around the anus. They move around in the pubic hair and suck blood to stimulate the skin to produce intense itching and red spots on the skin, and due to itching, they usually scratch with their hands, which leads to scratches and erythema on the pubic skin, etc. Pubic lice have a large number of eggs attached to the pubic hair and anus hair, which is highly contagious. In the treatment, husband and wife need to be treated together, the genital area of the pubic hair and anal body hair will be removed completely, and the pubic lice attached to the pubic skin, and then apply sulfur ointment, a few days can be completely cured, no longer contact with pubic lice, will not recur. The used underwear, towels, bed sheets and other related daily necessities, etc. should be boiled in boiling water and exposed to the sun to kill pubic lice or eggs, and the culled pubic hairs should be thoroughly destroyed. Recurrence of pubic lice after one month of recovery from treatment is recommended to seek medical advice and treatment under the guidance of a doctor.