Yes, you can have just one head louse, especially in the very early stages of an infestation, but it's more common to find just the eggs (nits) at first, and a single adult female can quickly start a full infestation by laying many eggs (nits). Because lice move quickly and shy from light, finding only one bug doesn't mean the infestation isn't established, so it's important to check thoroughly with a fine-toothed comb for both live lice and nits close to the scalp and treat if you find either.
Head lice spread by close head-to-head contact with someone who already has them. Sharing hats, brushes, or other hair items can also transfer lice. They don't come from dirty hair, and luckily they can be treated with special shampoos or lotions you can find at pharmacies.
The lice will be dark in color and the size of a poppyseed. Look for nits near hair follicle about ¼ inch from scalp. Nits (eggs) will be white or yellowish-brown. Nits are often more easily seen than lice, especially when the person has dark hair.
Itching is the most common symptom of head lice. People who have head lice for the first time may not feel itchy right way. It can take 4 to 6 weeks for itching to start. You may be able to see lice, but they move quickly, avoid lights and are small.
There are many other causes of scalp itching that can be mistaken for head lice. These include folliculitis, psoriasis, eczema and dandruff, but they do not have the features mentioned above.
The life cycle of the head louse has three stages: egg, nymph, and adult louse. Nits are lice eggs. They are hard to see and are often confused for dandruff or hair spray droplets. The nit is laid by the female near the base of the hair shaft and usually takes about 8-9 days to hatch.
Identify Your Symptoms
Most people don't experience itching until they've had lice for 4-6 weeks. If you just started itching, your infestation likely began at least four weeks ago. People who have had lice before may develop itching more quickly during subsequent infestations.
Symptoms of head lice include:
Yes, head lice can briefly live and crawl onto pillows after falling off a human host, but they die within 1-2 days without a blood meal from a human scalp, making pillows a low risk for transmission; nits (eggs) won't hatch off the scalp and need heat to survive, so washing bedding in hot water kills them effectively. The main risk is head-to-head contact, not furniture or bedding.
An infestation with lice is called pediculosis. In a normal healthy child, an infestation usually involves less than 10 live lice (7). Infestations may be asymptomatic. Itching may occur if the individual becomes sensitized to antigenic components of louse saliva that is injected as the louse feeds (7).
Live lice will often try to scurry away from the light, so look closely for movement. Feel for tiny bumps along the hair shaft, and use a magnifying glass to inspect more thoroughly. A white towel or sheet underneath can help you spot lice or nits more easily against darker hair.
Lice infestation is a commonly encountered disorder in emergency medicine. The louse survives from a blood meal from its host; hence, iron deficiency anemia is a theoretic possibility.
These steps may help you get rid of lice:
The nymph looks like an adult head louse but is much smaller (about the size of a pinhead [1.5 mm]). Nymphs become adults about 9 to 12 days after hatching. Adult louse. An adult louse can multiply fast and lay up to 10 eggs a day.
There are two reasons for a recurrent lice infestation: The lice treatment you used didn't work. You or someone in your family came in contact with lice again.
The best way to check is by using a fine-tooth comb on wet hair. After applying lots of conditioner, comb the hair out in very small sections, and look for lice or nits on the comb. You can wipe the comb onto a tissue or paper towel where it will be easier to see them.
Lice can be mistaken for dandruff because both can cause itching and white particles to appear in the hair. However, there are key differences in appearance, location, and symptoms. Dandruff flakes are usually larger and more visible than lice eggs, scattered throughout the hair rather than attached close to the scalp.
Wet combing, smothering or dehydrating are ways to kill head lice. Or you can use medicine available with or without a prescription. The medicine may not kill the newest eggs. So a second treatment at the right time to kill nymphs may be needed.
Common symptoms of lice include:
Don't Obsess Over Nits
Generally, if no live crawling insects are seen three weeks after the treatment, it's safe to assume that they are gone. Nits would have hatched by that time if they were alive. Nits and their shells may remain in the hair for some time but won't be viable.
Lice Exposure: Low Risk for Getting It
Most children who are exposed to someone with head lice do not get them. Lice cannot jump or fly. They can only crawl. Lice are only passed to others by close head-to-head contact.
Stage 1: Nits (Eggs)
Firmly attached to the hair shaft, usually near the scalp, behind the ears and at the nape of the neck on adults and older children and on the crown on younger children. Hatch in 6–9 days.
Yes, head lice can briefly live and crawl onto pillows after falling off a human host, but they die within 1-2 days without a blood meal from a human scalp, making pillows a low risk for transmission; nits (eggs) won't hatch off the scalp and need heat to survive, so washing bedding in hot water kills them effectively. The main risk is head-to-head contact, not furniture or bedding.