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Head louse egg (nit) attached to hair shaft of host. Like most insects, head lice are oviparous. Females lay about three or four eggs per day. Louse eggs (also known as nits), are attached near the base of a host hair shaft. [11] [12] Eggs are usually laid on the base of the hair, 3–5 mm off the scalp surface.
The presence of nits alone, however, is not an accurate indicator of an active head louse infestation. Generally, white nits are empty egg casings, while brown nits may still contain viable louse larva. One way of determining the nit is to squeeze it between two fingernails; it gives a characteristic snapping pop sound as the egg bursts.
[27] [30] [31] [32] Opponents to the no-nit policy mention that visible nits may only be empty egg casings which pose no concern as transmission can only occur via live lice or eggs. [27] This has led to the perception that the no-nit policy serves only to ease the workload of school nurses and punish the parents of infested children. [27]
Although they show the same symptoms, they have very different treatment plans.
The symptoms of dandruff vs dry scalp can look and feel similar, but causes and treatments differ. Experts explain the difference between the two conditions.
Scalp issues can be unsightly and uncomfortable. If you notice yourself dealing with scalp pain, redness, flaking and itching, you may be dealing with scalp conditions like dandruff or dry scalp.
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