People can also mistake hair casts (dandruff) and hair spray droplets for nits. But, if it comes off easily, or flakes off, it is not a nit.
People who have been treated for lice over an excessive amount of time (or used a variety of chemical based other hair treatments ie. hair dyes, shampoos/conditioners etc) can develop DEC plugs (Desquamated Epithelial Cells.)
This is oil produced by the scalp compensating for excessive dryness. DEC plugs can be the result of too many pediculicidal treatments. They are white, greasy clumps stuck to a hair shaft and they usually stick all the way around the hair shaft instead of being attached at an angle to one side.
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