Genital “crabs” are a common, itchy but usually harmless infestation of tiny lice that live in pubic hair and other coarse body hair, most often spread through close sexual contact.

What are genital crabs?

  • Genital crabs is the everyday name for pubic lice, a small parasite that feeds on blood from the skin in the genital area.
  • They look a bit like miniature crabs under magnification, which is where the nickname comes from.
  • They are different from head lice and body lice, and usually prefer coarse hair like pubic, armpit, beard, chest, and sometimes eyelashes or eyebrows.

How they live and spread

  • Pubic lice lay eggs (“nits”) stuck to the hair shaft near the skin; these hatch after about a week.
  • The most common way people get crabs is through sexual contact, as the lice crawl from one person’s hair to another’s during close body contact.
  • Less commonly, they can spread via sharing contaminated bedding, towels, or clothing, but this is not the main route.

Symptoms to watch for

Typical signs show up a few days after infestation and include:

  1. Itching
    • Intense itching in the pubic area (and sometimes other hairy areas) that is often worse at night when lice are more active.
  1. Visible clues in hair and on skin
    • Tiny lice or moving specks in the hair.
    • Small white or yellowish dots firmly stuck to hair shafts that are hard to brush off (these are the nits).
 * Fine, dark specks in underwear (lice droppings) and tiny spots of blood from bites.
  1. Skin changes
    • Pale blue or grayish spots on thighs, lower abdomen, or around the genitals from repeated bites.
 * Red, irritated, or scratched skin from itching; sometimes mild fever or feeling run down in heavier infestations.

If you notice persistent genital itching plus any of the signs above, it’s sensible to get checked for pubic lice and other sexually transmitted infections at a clinic.

Are genital crabs an STI?

  • Pubic lice are often classed as a sexually transmitted infection (STI) because sex is the main way they spread.
  • They are annoying and contagious but typically don’t cause serious long‑term health problems if treated properly.
  • Having crabs can sometimes be a flag that you should be screened for other STIs at the same time.

Diagnosis

A clinician usually diagnoses pubic lice by:

  • Looking closely at the pubic hair and other coarse hair (armpits, chest, beard, eyelashes if needed) for live lice and nits.
  • Sometimes using a magnifying glass or special light to make them easier to see.
  • Asking about sexual contacts and recent partners, since they may also need treatment.

Treatment and self‑care

The good news: crabs are very treatable with standard lice medicines.

1. Medicated lotions or shampoos

  • First‑line treatment is usually an over‑the‑counter lotion, cream, or shampoo containing permethrin 1% or pyrethrins with piperonyl butoxide, applied to the affected hair and skin as directed.
  • The product is left on for the recommended time, then rinsed off, and nits are removed with fingers or a fine‑tooth comb.
  • A second treatment 7–10 days later is often advised to catch any lice that hatch from remaining eggs.

2. Cleaning environment and clothing

  • Wash underwear, bed linens, and towels in hot water (around 60°C) and dry them on a hot setting to kill lice and nits.
  • Items that cannot be washed can be dry‑cleaned or sealed in a plastic bag for about two weeks so lice die off.

3. Sexual partners and sex life

  • Recent sexual partners (often within the past month or two, depending on local guidance) should be informed and treated, even if they don’t itch yet.
  • Avoid sexual contact until treatment is completed and symptoms have resolved, typically around 1–2 weeks.

4. When to seek medical help

See a doctor or sexual health clinic if:

  • Over‑the‑counter treatment doesn’t seem to work, or itching remains severe.
  • The lice are in your eyelashes or around the eyes (this needs special care).
  • You are pregnant, breastfeeding, or treating a child and need guidance on safe products.
  • You want a full STI check‑up at the same visit.

Risks, myths, and what it means

  • Having genital crabs doesn’t mean someone is “dirty” – lice can’t tell if you shower a lot; they just like coarse hair and close contact.
  • Shaving pubic hair alone doesn’t reliably cure an infestation; you still need proper lice treatment and cleaning of clothes and bedding.
  • If properly treated, pubic lice do not usually cause scarring or infertility and do not turn into more dangerous diseases.

Small example scenario

Someone notices intense itching in their pubic area a week after a new sexual partner. They see tiny white dots stuck to hairs and some dark specks in their underwear. They go to a sexual health clinic, where a clinician spots live lice on the pubic hair. They use a permethrin lotion as instructed, wash bedding and clothes on a hot cycle, let partners know, and avoid sex for about two weeks. The itching settles after treatment, and a check‑up confirms the lice are gone.

TL;DR

Genital crabs are pubic lice: tiny insects that live in pubic and other coarse hair, cause intense itching, and are mainly spread through sexual contact. They are very treatable with medicated lotions or shampoos plus hot‑washing clothes and bedding, and they rarely cause serious long‑term health issues when managed correctly.

Information gathered from public forums or data available on the internet and portrayed here.