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When is a Nit Not a Nit?

a visual guide to what's what

Critter CardsTM: get instructions to help you distinguish lice and nits from hair debris!

If a parent reports ongoing problems with nits without ever seeing a louse, it may be a sign of confusion in determining nits versus common hair debris.  This debris is often referred to as DEC plugs and hair casts.

DEC plugs (desquamated epithelial cells) may occur when oil glands in the scalp work to compensate for the drying effects of chemical treatments.  They are bright, white, irregularly shaped clumps of fat cells stuck to the hair.

Hair casts are thin, elongated, cylinder-shaped segments of dandruff which encircle the hair shaft and are easily dislodged.

A Nit (Louse Egg) is a smooth, oval shaped structure which is attached to the side of the hair shaft ranging in color from off-white to brown and is slightly smaller than a sesame seed.  Nits are always the same shape; they are never irregular, fuzzy, or encircling the hair (although the glue that the louse produces may be seen to encircle tightly around the hair shaft).



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The National Pediculosis Association,® Inc.
A Non-Profit Organization
Serving The Public Since 1983.

2018 marks 35 years of Service.

The NPA is a 501(c)(3) tax-exempt non-profit volunteer organization, including scientific advisors, dedicated since 1983 to protecting children and their environment from the misuse and abuse of prescription and over-the-counter pesticide treatments for lice and scabies.
The LiceMeister comb® was developed by the NPA in 1997 to provide a higher standard for lice combing tools and a safe, cost-effective treatment alternative to pesticides. Proceeds from sales of the LiceMeister comb allow the NPA to be self-sustaining while accomplishing its mission.

©1997-2018 The National Pediculosis Association®, Inc.
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The LiceMeister Comb for liceremoval