Crabs (Pubic Lice): Symptoms, Treatment and Cure in India

• Pubic lice ("crabs") are tiny insects that live in pubic and other coarse body hair and cause intense itching, usually worse at night.
• They spread almost always through close intimate or sexual contact, occasionally via very recently used bedding, towels or underwear, and essentially never from toilet seats.
• Treatment is simple, cheap and over-the-counter in India: 1% permethrin or pyrethrin applied to the area, repeated after 7 to 10 days.
• All sexual partners from the last few months should be treated at the same time to prevent reinfestation, even if they have no symptoms.
• Crabs do no lasting harm and do not transmit HIV or hepatitis, but their presence is a reason to get a full STI check.
• Itching can linger for a week or two after the lice are dead; this is an allergic reaction, not treatment failure.

Pubic lice (Pthirus pubis) are tiny insects, about 1 to 2 millimetres long when fully grown, that have evolved to live in coarse hair, most often in the pubic region. They are biologically different from head lice and body lice, and they cannot swap habitats: head lice do not move to the pubic area, and pubic lice do not infest the adult scalp. Their large, pincer-like front claws are what make them look crab-like under a magnifying glass, and those claws are perfectly shaped to grip thick, widely spaced pubic and body hair.

Pubic lice feed on human blood several times a day, injecting saliva as they bite. That saliva triggers the allergic reaction that causes the intense itching. If you have never had them before, itching may take 2 to 4 weeks to start; if you have had them previously, it can begin within days.

Their life cycle runs about 3 to 4 weeks. Females lay one to two eggs (called nits) a day, cementing them to the base of a hair. Nits are pale, oval and about 0.5 millimetres long; they hatch in 6 to 10 days into nymphs, which mature into adults that live for roughly one to two months on the body.

Away from a human host, pubic lice die within 24 to 48 hours because they need regular blood meals and body warmth. This single fact shapes everything about treatment: there is no need to fumigate your home, because lice cannot survive long on furniture or surfaces. Globally, cases have been declining as pubic hair removal (waxing, shaving and laser) has become more common, since it removes the lice's habitat, but crabs remain a routine diagnosis in Indian dermatology and STI clinics. They can affect anyone of any age, gender or background, and they are not a sign of poor hygiene.

The hallmark symptom is intense itching in the pubic area, usually worst at night when the body is warm and the lice are most active. It often starts as a vague tickle that builds over days to weeks, which is why people frequently blame soap, sweat or vaginal itching from other causes before they realise what is going on.

What to look for:

Pubic lice spread mainly through prolonged, direct skin-to-skin contact, most often during sex. The pubic hair of both partners comes into close contact, and the slow-moving lice crawl across. Brief or casual contact rarely transmits them; sustained intimate contact is what creates the opportunity. This is true regardless of gender or sexual orientation, and it is one of the reasons crabs are classed as a sexually transmitted infection. A diagnosis is a sensible cue to get the full range of STI tests, since the same exposure can pass on other infections.

Sharing very recently used bedding, towels or underwear can occasionally transmit lice, because they can survive up to 24 to 48 hours off the body. In practice this is uncommon, but it matters more in shared housing, hostels and similar settings. Sharing underwear is the highest-risk item because it touches the area directly.

What does not spread pubic lice is just as important. They cannot jump or fly; they crawl slowly and need hair to grip. They cannot survive on cool, smooth surfaces, and they cannot travel through water. So the belief that you can catch crabs from a toilet seat, swimming pool or gym bench is essentially a myth. Transmission almost always means direct intimate contact with another person.

They also do not transmit blood-borne infections. Because pubic lice do not move between hosts the way mosquitoes do, they do not spread HIV, hepatitis or syphilis through their bites. What their presence does signal is that intimate contact happened, which is why the more important step is checking for other STIs that may have come along at the same time.

Diagnosis is clinical and quick. There is no blood test or swab; a doctor simply sees the lice or nits in the hair. A dermatologist, gynaecologist, general physician or STI specialist examines the area in good light, often with a magnifying lens or dermatoscope, and may also check the underarms, abdomen, thighs, eyebrows and eyelashes if wider spread is suspected.

The examination can feel awkward the first time. Clinicians do this routinely and treat it as ordinary. You are entitled to ask for a same-gender doctor and for a chaperone (a second staff member present), and good clinics offer this by default. Telemedicine is usually not enough, because the lice and nits are too small to see clearly on a phone camera.

Because crabs are sexually transmitted, most clinicians will offer a full STI screen at the same visit, which typically covers HIV, Syphilis in Women: Stages, Tests and Penicillin Cure, chlamydia and gonorrhoea and hepatitis B and C. A comprehensive private panel in India costs roughly Rs 2,500 to 6,000, while government NACO Suvidha clinics offer free or low-cost STI screening, with counselling included. The visit is a good moment to talk through which partners may need notifying and how. Your information is confidential; pubic lice are not a notifiable condition and no one is told without your consent.

Children need particular care. Because pre-pubertal children have no pubic hair, lice in a child usually appear on the eyelashes or eyebrows, most often picked up from close, innocent contact with an infested adult such as sharing a bed. Even so, any such case should be reviewed by a paediatrician, and child-protection safeguards under the POCSO Act apply if there is any concern.

Pubic lice are easy and cheap to treat. The first-line options worldwide and in India are 1% permethrin cream or lotion and 1% pyrethrin (with piperonyl butoxide) shampoo or lotion. Both kill lice by acting on the parasite's nervous system, with little absorption or risk to humans, and both are available over the counter. Treatment must be repeated after 7 to 10 days to kill any lice that hatch from surviving eggs, and all sexual partners should be treated at the same time even if they have no symptoms.

Because pubic lice die within 24 to 48 hours off the body, decontamination is far simpler than for bedbugs or scabies. You do not need to deep-clean the whole house. Focus only on items that touched the affected area in the last two days.

Notifying partners is essential, because without simultaneous treatment, reinfestation is almost certain. The usual advice is to tell sexual partners from roughly the last one to three months so they can be checked and treated. Compared with chronic infections, this is a low-stakes conversation: crabs are completely curable, and treatment is a single cream from any pharmacy.

Keep it brief and factual. Something like: "I was diagnosed with pubic lice. They are easily treated, but you should get checked and treated too. The cream is available at any chemist." Most people respond with brief surprise and then practical questions. The conversation you imagine is almost always worse than the one you actually have. If you would rather not contact someone directly, some clinics offer provider-assisted or anonymous notification.

A few specifics matter. In an ongoing relationship, both of you must be treated together and avoid sex until you are both clear, to prevent a ping-pong cycle. In extramarital or non-consensual situations the medical steps do not change, but the emotional fallout can be heavy, and anonymous notification is an option. If a partner refuses treatment, complete your own and avoid contact with them until they are clear.

This can stir up real anxiety. If shame or worry is overwhelming, confidential support is available through TARSHI (1800-258-9999) and iCall (9152987821), and a trusted friend or counsellor can help you rehearse the conversation.

Pubic lice are not prevented by condoms, because the lice live in the surrounding hair rather than in genital fluids. Condoms remain essential for other STIs, but for crabs you need different strategies. The most reliable protection is awareness and prompt action: if pubic itching persists, examine yourself carefully with a magnifying glass, because early detection means quick, low-disruption treatment.

Most cases are straightforward, but a few groups need adjustments.

Pubic lice are often manageable with over-the-counter treatment, but see a doctor or visit a NACO Suvidha clinic if any of the following apply.

Few conditions produce so much shame for so little actual harm. Pubic lice cause no organ damage, no chronic disease and no onward transmission of other infections, and they clear in days for a few hundred rupees. Yet the combination of being sexually transmitted, involving a parasite, and affecting a private part of the body makes them feel mortifying, and conservative cultural norms in India can sharpen that.

The reality is mundane. Crabs are a parasite that has lived on humans for millions of years and can affect anyone, regardless of how often they bathe or how many partners they have had. They are not a marker of promiscuity or poor hygiene, and they are not contagious in casual contact. The danger of the shame is practical: it delays treatment, worsens the infestation and risks passing lice to more partners.

Disclosure is usually harder in your head than in real life, and most partners react with brief surprise rather than judgment. For fully treated crabs there is no remaining infection, so ongoing disclosure to future partners is not medically necessary. Most modern Indian dermatologists and STI specialists handle this without moralising; if you meet one who does not, you are free to seek care elsewhere, and NACO Suvidha clinics are trained in non-judgmental sexual-health care. Looking back a few years on, the episode almost always feels far smaller than it did at the time.

• World Health Organization (WHO) - Sexually transmitted infections (STIs))
• Centers for Disease Control and Prevention (CDC) - Pubic "Crab" Lice
• NHS (UK) - Pubic lice
• National AIDS Control Organisation (NACO), India - STI/RTI Services
• DermNet - Pubic lice (Pthirus pubis infestation)