Later Symptoms of Body Lice
The nit hatches into a baby body louse called a nymph. It looks like an adult body louse, but is smaller. Nymphs mature into adults about seven days after hatching. To live, the nymph must feed on blood.
Adult Body Louse
The adult louse is about the size of a sesame seed, has six legs, and is tan to grayish-white in color. In persons with dark hair, the adult louse will look darker. Females, which are usually larger than the males, lay eggs. Adult lice can live up to 30 days on a person's body. To live, adult lice need to feed on blood. If the louse falls off a person and doesn't get a blood meal, it dies within 10 days.