Life cycle. Almost exclusively a parasite of man. Infestation is usually through sexual intercourse, but it can arise from infested clothing or bedding. P. pubis dwell primarily in the pubic region, but it may also be found in the axilla, beard, mustache, eyebrows, eyelashes, and chest. The life cycle, from egg laying to formation of the adult, is about 17-25 days. The female lay about 30 eggs during her life. The eggs (nits) are cemented to hair, and hatch within 6 to 8 days. The nymph undergoes three molts within two weeks. The life span of the adult is about 1 month.