Head lice infest and cause itch and irritation in the scalp.
This can take several weeks to develop after the initial infestation.
Scratching can cause crusting and scaling on the scalp.
Occasionally secondary bacterial infection of the scalp results in small sores on the scalp with tender glands in the neck.
Dermatitis can also occur with a heavy infestation of lice.
It is important to identify the lice (or nits) to make a correct diagnosis.
Lice are around 3mm in length and can be seen moving from hair to hair.
Unhatched eggs have a dark area within the shell while hatched eggs are transparent.
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