Pubic lice, commonly called crabs, are tiny insects found in your genital area. They are a different type of louse from head lice and body lice. Measuring 1/16 inch (1.6 millimeters) or less, pubic lice received their nickname because their bodies resemble sea crabs.
The most common way to acquire pubic lice is through sexual intercourse. In children, pubic lice may be found in the eyebrows or eyelashes and can be a sign of sexual abuse. However, children can sometimes catch pubic lice from heavily infested parents simply by sharing a communal bed.
Pubic lice feed on your blood, and their bites can cause severe itching. Treatment includes applying over-the-counter creams and lotions that kill the parasites and their eggs.