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You might not even see the bites first—the initial giveaway might be tiny lice eggs (a.k.a. nits) first. ... invisible to the naked eye. Their bites take the form of flat, red patches or raised ...
There may be some grey-blue discolouration at the feeding site, and eggs and lice may be visible. [1] [2] [3] Scratch marks, crusting and scarring may be seen, and there may be signs of secondary bacterial infection. [1] Diagnosis is by visualising the nits or live lice, either directly or with a magnifying glass. [5]
The thoracic segments are fused, but otherwise distinct from the head and abdomen, the latter being composed of seven visible segments. [9] Head lice are grey in general, but their precise color varies according to the environment in which they were raised. [9] After feeding, consumed blood causes the louse body to take on a reddish color. [9]
Bull's eye rash (TODAY) ... which causes a burning sensation, Frye says. Lice bites. Lice in hair. (Srisakorn / Getty Images) What they look like: ... you might notice lice eggs called nits ...
Head lice are about 2 to 3 millimeters long, and they usually infest the head or neck and attach their eggs to the base of the hair shaft, according to the CDC.
Lice generally cannot survive for long if removed from their host. [5] If their host dies, lice can opportunistically use phoresis to hitch a ride on a fly and attempt to find a new host. [6] Sucking lice range in length from 0.5 to 5 mm (1 ⁄ 64 to 13 ⁄ 64 in). They have narrow heads and oval, flattened bodies.
Body lice may lay eggs on the host hairs and clothing, [3] but clothing is where the majority of eggs are usually secured. [4] Since body lice cannot jump or fly, they spread by direct contact with another person or more rarely by contact with clothing or bed sheets that are infested. [5]
Females typically lay 150–300 eggs over an interval of 2–3 weeks. The eggs, commonly known as nits, are oblong and around 1 mm long. The eggs are glued to the hairs or feathers of the host with a secretion from the female accessory glands. The eggs typically hatch several days or up to three weeks from the time they are laid.