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General health information, not a diagnosis. In an emergency, call 102. Always consult a qualified health professional.
Head lice are tiny insects that live on people's heads. Adult lice are about the size of sesame seeds. The eggs, called nits, are even smaller - about the size of a dandruff flake.
Sources: SI, NLM MedlinePlus · Reference · MedlinePlus (US NLM) · Mayo Clinic
Findings that point to it: lice.
Sources: SI, NLM MedlinePlus · Reference · MedlinePlus (US NLM) · Mayo Clinic
See a qualified clinician to confirm or rule this out, sooner if symptoms worsen.
Sources: SI, NLM MedlinePlus · Reference · MedlinePlus (US NLM) · Mayo Clinic
Tests used to confirm: wet combing or dimeticone; treat contacts with live lice.
Sources: SI, NLM MedlinePlus · Reference · MedlinePlus (US NLM) · Mayo Clinic
Treatment is decided by a clinician after confirming the diagnosis. No dosing information is given here.
Sources: SI, NLM MedlinePlus · Reference · MedlinePlus (US NLM) · Mayo Clinic
NICE CKS head lice
Sources: SI, NLM MedlinePlus · Reference · MedlinePlus (US NLM) · Mayo Clinic
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Text: SI summary in its own words (CC BY 4.0) with NLM MedlinePlus public-domain summary; facts checked against WHO fact sheets (CC BY-NC-SA 3.0 IGO, paraphrased with attribution) and Mayo Clinic (linked reference only, no text used); ICD-10 and labels from Wikidata (CC0).