(Pubic Lice, Crab Lice)

Pruritus of the anogenital area is a common symptom in pubic lice infestations ("crabs" or "pthiriasis"). The parasite most frequently is found in the pubic region but also can infest on the eyelashes, eyebrows, beard, axilla, perianal area, and rarely, the scalp. A characteristic sign of heavy pubic lice infestation is the presence of bluish or slate-colored macules (maculae ceruleae) on the chest, abdomen, or thighs.