The Complete Self-Check & Treatment Guide: What to Do If You Suspect Crabs

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You cannot confirm an infestation through sensation alone. Jock itch, contact dermatitis, and folliculitis produce overlapping irritations. A definitive Pthirus pubis diagnosis requires tangible physical evidence: either the moving organism itself or its firmly anchored eggs.

Set up a clinical self-inspection station. You will need a high-lumen flashlight or phone light, fine-point tweezers, and a high-magnification reading glass. Find a well-lit bathroom and prepare to inspect the base of individual follicles.

Start your pubic hair self-check by parting coarse hair systematically from the base of the groin upward toward the navel. A louse measures between 1.1 and 1.8 millimeters in length, about the size of a pinhead. They are semi-translucent, tan-to-grayish white, and feature six crab-like legs with prominent claws tailored specifically to grasp hairs spaced widely apart. Because they move slowly and often sit flush against the skin surface, a casual glance usually misses them.

Shift your focus toward the hair shafts themselves. That is where you find crab lice nits. Nits are oval, glistening casings glued tightly to the base of the hair, usually within 0.5 centimeters of the skin surface. Unlike shed skin cells or hair casts, nits do not budge when blown on or brushed with a finger. If you can slide the white speck off effortlessly with your thumb, it is likely simple sebum or dandruff. If it feels cemented to the follicle and resists light friction, it is an egg.

Take your magnifying glass inspection beyond the pubic region. While *Pthirus pubis* prefers pubic and perianal zones, it readily colonizes other coarse body hair, including the armpits, chest, beard, and even eyelashes. Scalp hair is typically spared because the distance between scalp hairs is too narrow for crab claws to grasp comfortably.