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STD Information Center > Crabs STD (Pubic Lice)

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STD Information Center
Crabs (Pubic Lice)

 

Crabs is a sexually transmitted disease in which pubic lice infest the genital area of males or females, creating an itching sensation. Sometimes the public lice can be seen crawling in the pubic area.


What are Crabs?

Known as "public lice," crabs are parasitic insects found in the genital area of humans. Infection is common and found worldwide.


How did I get pubic lice?
Pubic lice are usually spread through sexual contact. Rarely, infestation can be spread through contact with an infested person's bed linens, towels, or clothes. A common misbelief is that infestation can be spread by sitting on a toilet seat. This isn't likely, since lice cannot live long away from a warm human body. Also, lice do not have feet designed to walk or hold onto smooth surfaces such as toilet seats.

Infection in a young child or teenager may indicate sexual activity or sexual abuse.


Where are pubic lice found?
Pubic lice are generally found in the genital area on pubic hair; but may occasionally be found on other coarse body hair, such as hair on the legs, armpit, mustache, beard, eyebrows, and eyelashes. Infestations of young children are usually on the eyebrows or eyelashes. Lice found on the head are not pubic lice; they are head lice.

Animals do not get or spread pubic lice.


What are the signs and symptoms of pubic lice?
Itching in the genital area. Nits (lice eggs) or crawling lice may be seen.


What do pubic lice look like?
There are three stages in the life of a pubic louse: the nit, the nymph, and the adult.

Nit:
Nits are pubic lice eggs. They are hard to see and are found firmly attached to the hair shaft.

They are about the size of the mark at the end of this arrow . They are oval and usually yellow to white. Nits take about 1 week to hatch.

Nymph:
The nit hatches into a baby louse called a nymph. It looks like an adult pubic louse, but is smaller. Nymphs mature into adults about 7 days after hatching. To live, the nymph must feed on blood.

Adult:
The adult pubic louse is about this size and resembles a miniature crab when viewed through a strong magnifying glass. Pubic lice have six legs, but their two front legs are very large and look like the pincher claws of a crab; this how they got the nickname "crabs." Pubic lice are tan to greyish-white in color. Females lay nits; they are usually larger than males. To live, adult lice need to feed on blood. If the louse falls off a person, it dies within 1-2 days.


How is a pubic lice infestation diagnosed?
By looking closely through pubic hair for nits, nymphs, or adults. Finding a nymph or adult may be difficult; there are usually few of them and they can move quickly away from light. If crawling lice are not seen, finding nits confirms that a person is infested and should be treated. Diagnosis should be made by a health care provider if you are unsure about infestation or if treatment is not successful.


How are pubic lice treated?
A 1% permethrin or pyrethrin lice shampoo, also called pediculicide peh-DICK-you-luh-side, is recommended to treat pubic lice. These products are available with out a prescription at your local drug store. Medication is generally very effective; apply the medication exactly as directed on the bottle. A prescription medication, called Lindane (1%) is available through your health care provider. Lindane is not recommended for pregnant or nursing women or for children less than 2 years old.

How to treat pubic lice infestations: (Note: see section below for treatment of eyelashes or eyebrows. The lice medications described in this section should not be used near the eyes.)

    1. Wash the infested area; towel dry.
    2. Thoroughly saturate hair with lice medication. If using permethrin or pyrethrins, leave medication on for 10 minutes; if using Lindane, shampoo should only be left on for 4 minutes. Thoroughly rinse off medication with water. Dry off with a clean towel.
    3. Following treatment, most nits will still be attached to hair shafts. Nits may be removed with fingernails.
    4. Put on clean underwear and clothing after treatment.
    5. To kill any lice and nits that may be left on clothing or bedding, machine wash those washable items that the infested person used during the 2-3 days before treatment. Use the hot water cycle (130o F) of the washing machine to wash clothes. Use the the hot cycle of the dryer for at least 20 minutes to dry clothes.
    6. Dry clean clothing that is not washable.
    7. Inform any sexual partners that they are at risk for infestation.
    8. Avoid any sexual partners until partners have been treated and infestation has been cured.
    9. Retreat in 7-10 days if lice are still found.

To treat nits and lice found on eyebrows or eyelashes:
If only a few nits are found, it may be possible to remove live lice and nits with your fingernails or a nit comb.

If additional treatment is needed for pubic lice nits found on the eyelashes, applying an ophthalmic- grade petrolatum ointment (only available by prescription) to the eyelids twice a day for 10 days is effective. Vaseline* is a kind of petrolatum, but is likely to irritate the eyes if applied


.< STD Information Center | STD Prevention >

If you think you may have a sexually transmitted disease, you should see a physician immediately to be properly diagnosed and treated. You should not try to diagnose or treat symptoms on your own.


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