Pubic lice (crabs)

Overview:

Pubic lice (pediculosis/crabs/pubic crabs) are are small, wingless parasites that live in public hair around the genitals & perianal regions, feeding off the blood of their host. They can also be found on other areas of the body that has thick hair such as beard, under arms, eyebrows & eyelashes.

The most common mode of transmission is close physical contact, such as during sexual activity. Pubic lice can also be spread via shared towels, clothing, bedding etc.

Infestation with lice is known as pediculosis.

Signs of public lice:

Symptoms usually appear within a week or two of infection.

• The most common symptom of pubic lice is itching, it may be worse at night.  
• Inflammation, rash & red papules may occur due to itching, scratching & sensitivity.
• Faint blue spots may also be visible where the louse has bitten.
• Greyish coloured lice or white/yellow eggs (nits) may be visible on the hair.

Treatment for pubic lice:

• Topical insecticidal ointments & preparations that contain permethrin 1%. This is applied to cool, dry skin (from the chest down) and left for 10 minutes. Treatment will need to be repeated 7-10 days later to kill any lice that have hatched in the meantime.
• Dead lice & nits may be removed with a nit comb or the fingernails.
• Wash in hot water and tumble dry all bedding, underwear & towels.
• Sexual partners should also be treated.
• If there are lice in the eyelashes or eyebrows see your GP. They will need to prescribe an ointment to remove lice and eggs. Products containing permethrin should not be applied to the eyelashes or eyebrows.