When should the head be treated for lice? - briefly
Treat the scalp as soon as live lice are confirmed by a visual inspection or a nit count, even if itching is mild. Delay treatment only if no viable insects are found after a thorough combing.
When should the head be treated for lice? - in detail
Lice infestation requires prompt intervention once viable insects or viable eggs are confirmed on the scalp. Treatment should begin immediately after a reliable diagnosis, which can be established by:
- Visual inspection of live nymphs or adult lice using a fine-toothed comb on a well‑lit surface.
- Detection of viable nits (eggs) attached within 0.5 cm of the hair shaft, indicating recent oviposition.
If only empty egg shells (hatched nits) are present, treatment may be deferred, but a follow‑up examination within 5‑7 days is advised to rule out emerging lice.
Infants under two months, pregnant individuals, and people with known sensitivities to common pediculicides should receive alternative, non‑chemical options (e.g., manual removal, silicone‑based sprays) before conventional medication is considered.
High‑risk environments—schools, daycare centers, or households with multiple affected members—warrant simultaneous treatment of all close contacts, regardless of symptom presence, to prevent rapid re‑infestation.
A single treatment course is insufficient when live lice are observed after 7‑10 days; a second application should be scheduled according to the product’s residual activity window, typically 7‑9 days after the first dose.
In summary, initiate scalp treatment as soon as live lice or fresh, viable nits are identified, adjust the approach for vulnerable populations, and repeat therapy according to the pesticide’s lifecycle to ensure eradication.