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Doctor insights on: Lice And Crabs

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Can you catch body lice or crabs in public? Like on bus seats or anything like that??

Can you catch body lice or crabs in public? Like on bus seats or anything like that??

Body lice: You need to have close or intimate contact to catch but. But they can be on the clothes too. Be carful. ...Read more

Body Lice (Definition)

Body lice (pediculus humanus corporis) are similar to head lice. These are tiny parasitic insects live on the clothes and can often be seen at the seams. They feed on the blood of the host, and can spread certain infections. Generally these are found in the homeless or those who are ...Read more


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I have been prescribed selsun shampoo (2.5% selenium sulphide) by a doctor for having pubic lice or crabs. Will it work?

I have been prescribed selsun shampoo (2.5% selenium sulphide) by a doctor for having pubic lice or crabs. Will it work?

Pubic lice: A lice-killing lotion containing 1% Permethrin or a mousse containing pyrethrins and piperonyl butoxide can be used to treat pubic lice. These are available otc without a prescription, are safe and effective when used according to instructions in the package. Am unaware of evidence that selenium is effective against these critters, but am always willing to learn. ...Read more

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How can I confirm when pubic lice (crabs) are fully gone?

Examination: The skin has to be examined to be sure that the organisms are gone. They lay eggs for a followup after treatment is essential. ...Read more

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How to know if I have pubic crabs/lice or something else?

Pubic lice: The pubic louse (phthirus pubis) is also given the slang name of crabs. It is about 1/16th of an inch in size ; when magnified looks like a crab. It is most commonly spread during sexual intercourse. It is a different organism then the lice that infect the hair or the body. Blue spots may show on the skin where the lice have been feeding. Nits (eggs) may noted on the pubic hairs. ...Read more

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How do you get crabs lice and what's the treatment?

Sexual transmission: The crab louse is usually transmitted sexually. It is most common in teenagers and young adults. It can also be acquired from fomites, such as contaminated clothing, towels, and linens. Acquisition from toilet seats is unlikely. It is commonly treated with a topical pediculocide, such as 1% Permethrin cream or a pyrethrin. ...Read more

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How much time crabs lice at last after used lotion cream twice?

Depends: Pubic lice (phthirus pubis) can be treated with otc product like nix (permethrin) or rid. Other options are prescription medications like Malathion (kept on affected area for 8 to 12 hours); invermectin (2 pills – may need to repeated in 10 days); lindane (if you have failed other treatments). ...Read more

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How do you know if you have crabs. Do they look like head lice?

Sort of: They belong to similar family of lice. Pediculosis pubis can be googled and in general are a little fatter than head lice. It is difficult to see as you will require a magnifying lense or microscope to determine them. I would see your pcp or dermatologist locally for this. ...Read more

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Are crabs and pubic lice the same thing?

Yes: They are just different names for the same thing. ...Read more

Dr. Richard Rissmiller
323 doctors shared insights

Pediculosis (Definition)

Pediculosis is a condition in which a person has lice, a blood-feeding insect, on his or her body. Lice may be present in the head, body, or pubic area, and can be spread by contact between people. Itching ...Read more


Crabs (Definition)

Crab lice is a colloquial term for pubic lice, or the infection of pubic hair by the louse parasite that feeds on human blood. The main symptom is itching. ...Read more