Symptoms
Common signs and symptoms of Pubic Lice (Crabs) include:
When to see a doctor
If you experience severe or worsening symptoms, seek immediate medical attention. Always consult with a healthcare professional for proper diagnosis and treatment.
Causes & Risk Factors
Several factors can contribute to Pubic Lice (Crabs).
Pubic lice are caused by infestation with Phthirus pubis, a parasitic insect specifically adapted to live in human pubic hair.
Pubic lice are caused by infestation with Phthirus pubis, a parasitic insect specifically adapted to live in human pubic hair. These tiny creatures have evolved specialized claws that allow them to grip onto the thicker, coarser hair found in the genital region. Adult lice feed on human blood several times daily, using their needle-like mouthparts to pierce the skin and draw blood for nourishment.
The primary mode of transmission is through intimate skin-to-skin contact during sexual activity.
The primary mode of transmission is through intimate skin-to-skin contact during sexual activity. Unlike head lice, pubic lice cannot jump or fly, so they must crawl from one person's hair to another's during close physical contact. The lice can survive for about 24 hours away from the human body, which means transmission through shared bedding, towels, or clothing is possible but less common than direct contact.
Once established, female pubic lice lay their eggs, called nits, which they cement firmly to hair shafts close to the skin where warmth helps incubation.
Once established, female pubic lice lay their eggs, called nits, which they cement firmly to hair shafts close to the skin where warmth helps incubation. These eggs hatch in about a week, and the young lice mature into reproducing adults within another week or two. This rapid lifecycle means that without treatment, the infestation quickly becomes established and continues to spread throughout the affected hair areas.
Risk Factors
- Having multiple sexual partners
- Engaging in sexual activity with an infected person
- Sharing beds, towels, or clothing with infected individuals
- Living in crowded conditions with poor hygiene facilities
- Being sexually active without protective barriers
- Having other sexually transmitted infections
- Age group of 15-35 years (most sexually active period)
- History of previous pubic lice infestations
Diagnosis
How healthcare professionals diagnose Pubic Lice (Crabs):
- 1
Diagnosing pubic lice typically involves a visual examination by a healthcare provider or through careful self-inspection.
Diagnosing pubic lice typically involves a visual examination by a healthcare provider or through careful self-inspection. Doctors can usually identify adult lice crawling in the pubic hair or spot the characteristic nits firmly attached to hair shafts. The lice appear as small, gray or brown insects about the size of a pinhead, while nits look like tiny white or yellow oval specks glued to individual hairs close to the skin.
- 2
Healthcare providers may use a magnifying glass or special comb to get a better look at suspected lice or eggs.
Healthcare providers may use a magnifying glass or special comb to get a better look at suspected lice or eggs. They'll examine not just the pubic area but also other coarse hair regions like the chest, armpits, beard, or even eyelashes if symptoms suggest spread to these areas. The provider will also look for the telltale blue-gray bite marks on the skin and check for signs of secondary bacterial infection from scratching.
- 3
Laboratory testing is rarely necessary for pubic lice diagnosis, as visual identification is usually sufficient.
Laboratory testing is rarely necessary for pubic lice diagnosis, as visual identification is usually sufficient. However, doctors often recommend screening for other sexually transmitted infections since pubic lice can increase the risk of contracting other STIs. The healthcare provider may also ask about recent sexual contacts to help prevent reinfection and ensure that partners receive appropriate treatment.
Complications
- Most complications from pubic lice result from excessive scratching rather than the lice themselves.
- Vigorous scratching can break the skin and create openings for bacterial infections, leading to impetigo or cellulitis in the affected areas.
- These secondary infections may require antibiotic treatment and can leave temporary skin discoloration or scarring if severe.
- In rare cases, pubic lice can spread to eyelashes or eyebrows, particularly in children, which requires special treatment approaches since standard lice medications can be harmful near the eyes.
- Heavy infestations may cause significant skin irritation and inflammation, though permanent damage is uncommon.
- Some people develop allergic reactions to lice bites, resulting in more severe itching and skin reactions that may persist even after successful treatment.
Prevention
- Preventing pubic lice focuses primarily on avoiding intimate contact with infected individuals and practicing safe sexual habits.
- Using barrier protection like condoms during sexual activity can reduce the risk of transmission, though it doesn't provide complete protection since lice can spread through contact with areas not covered by condoms.
- Having fewer sexual partners and maintaining mutually monogamous relationships with uninfected partners significantly reduces exposure risk.
- Personal hygiene practices, while important for overall health, don't prevent pubic lice since these parasites can affect anyone regardless of cleanliness.
- However, avoiding shared personal items like towels, bedding, and clothing with people of unknown infection status can help prevent the less common forms of transmission.
- If you suspect exposure, checking regularly for signs of lice can help catch infestations early when they're easier to treat.
- Open communication with sexual partners about sexual health, including any history of pubic lice or other sexually transmitted infections, creates an environment where people feel comfortable seeking treatment promptly.
- Regular sexual health checkups can also help identify and treat pubic lice infestations before they become well-established or spread to multiple partners.
The standard treatment for pubic lice involves topical medications specifically designed to kill lice and their eggs.
The standard treatment for pubic lice involves topical medications specifically designed to kill lice and their eggs. Over-the-counter options include permethrin cream and pyrethrin-based shampoos, which are applied to all affected hair areas and left on for the recommended time before washing off. Prescription medications like malathion lotion or lindane shampoo may be necessary for resistant cases, though lindane is typically reserved for situations where other treatments have failed due to potential side effects.
Treatment should be applied to all areas with coarse hair, not just the obviously affected regions, since lice can spread beyond the pubic area to chest hair, armpits, and beard areas.
Treatment should be applied to all areas with coarse hair, not just the obviously affected regions, since lice can spread beyond the pubic area to chest hair, armpits, and beard areas. A second treatment is usually recommended 7-10 days after the first to catch any newly hatched lice that may have survived as eggs during the initial treatment. Some people prefer to shave affected areas completely, though this isn't necessary if medications are used properly.
All clothing, bedding, and towels used within the past few days should be washed in hot water and dried on high heat for at least 20 minutes.
All clothing, bedding, and towels used within the past few days should be washed in hot water and dried on high heat for at least 20 minutes. Items that cannot be washed should be sealed in plastic bags for two weeks to ensure any surviving lice die. Sexual partners from the past month should be notified and treated simultaneously to prevent reinfection, even if they don't show symptoms.
New treatment approaches include newer formulations of traditional medications and combination therapies for particularly stubborn infestations.
New treatment approaches include newer formulations of traditional medications and combination therapies for particularly stubborn infestations. Some research suggests that certain essential oil-based treatments may have anti-lice properties, though these haven't been proven as effective as conventional medications and shouldn't be relied upon as primary treatment.
Living With Pubic Lice (Crabs)
Living with pubic lice involves following treatment protocols carefully while managing the social and emotional aspects of the condition. Complete the full course of treatment even if symptoms improve quickly, and resist the urge to scratch, which can worsen skin irritation and increase infection risk. Cool compresses or over-the-counter anti-itch creams can help manage itching between treatments.
Latest Medical Developments
Latest medical developments are being researched.
Frequently Asked Questions
Update History
Apr 9, 2026v1.0.0
- Published by DiseaseDirectory