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Crab louse, female
Crab louse, female


Pubic louse-male
Pubic louse-male


Crab lice
Crab lice


Head louse and pubic louse
Head louse and pubic louse


Definition:

Pubic lice are small, six-legged creatures that infect the pubic hair area and lay eggs. These lice can also be found in armpit hair and eyebrows.



Alternative Names:

Pediculosis - pubic lice; Lice - pubic; Crabs



Causes, incidence, and risk factors:

Pubic lice are known as Phthirus pubis. Lice infestation is found mostly in adolescents.

Transmission generally occurs during sexual activity. However, it also can occur through physical contact with contaminated objects such as toilet seats, sheets, and blankets. Some women have gotten pubic lice while trying on bathing suits at a store.

Other types of lice include:

Risk factors include:

  • Being a sexually-active adolescent
  • Having multiple sexual partners
  • Having sexual contact with an infected person
  • Sharing bedding or clothing with an infected person


Symptoms:
  • Eggs (nits) or actual adult lice may be seen
  • Itching in area covered by pubic hair (often gets worse at night)
  • Skin reaction that is bluish-gray in color
  • Sores (lesions) in the genital area due to bites and scratching


Signs and tests:

An examination of the outer genital area typically reveals small gray-white oval eggs (nits) attached to the hair shaft. It may also reveal adult lice. The health care provider might also see scratch marks or signs of an infection such as impetigo .

Because pubic lice may cause an eye infection (blepharitis ) in young children, their eyelashes should be examined with a high-powered magnifying glass for evidence of lice.

Adult lice may be easily identified under the microscope. Their crab-like appearance is the reason that pubic lice are referred to as "the crabs."



Treatment:

Pubic lice are best treated with a prescription wash such as Elimite or Kwell:

  • Thoroughly work the shampoo into the pubic hair and surrounding area for at least 5 minutes.
  • Rinse well.
  • Comb the pubic hair with a fine-toothed comb to remove eggs (nits). Applying vinegar to pubic hair before combing may help loosen nits, but the hair should be dry when applying the shampoo.

A single treatment is all that is usually needed. If another treatment is recommended, it should be done 4 days to 1 week later.

Over-the-counter medications for the treatment of lice include Rid and Nix. Malathione lotion is another treatment option.

While you are treating pubic lice, wash all clothing and linens in hot water. Items that cannot be washed may be sprayed with a medicated spray or sealed (suffocated) in plastic bags and not used for 10 - 14 days. It is important for all intimate contacts to be treated at the same time.

People with pubic lice should be evaluated for other sexually-transmitted diseases at the time of diagnosis.



Support Groups:



Expectations (prognosis):

The proper treatment, including thorough cleaning, should get rid of the lice.



Complications:

The constant scratching and digging can cause the skin to become raw, and secondary infections may develop.



Calling your health care provider:

Call for an appointment with your health care provider if:

  • You or your sexual partner has symptoms of pubic lice
  • You try over-the-counter lice treatments and they are not effective
  • Your symptoms continue after treatment


Prevention:

Avoid sexual or intimate contact with infected people. If you are sexually active, use safe sex practices to avoid getting lice.

Good personal hygiene is always recommended. If possible, avoid trying on bathing suits while you are shopping. However, if you must try them on, be sure to wear your underwear. This may prevent transmission.



References:

Jacobson CC, Abel AA. Parasitic infestations. J Am Acad Dermatol. 2007;56:1026-1043.




Review Date: 10/11/2008
Reviewed By: Kevin Berman, MD, PhD, Atlanta Center for Dermatologic Disease, Atlanta, GA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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