How to know when you have been infected with lice? - briefly
Look for itching on the scalp, especially after a warm shower, and examine hair for small, brownish insects or translucent nits attached close to the scalp. Presence of multiple nits within a centimeter of the hair shaft confirms infestation.
How to know when you have been infected with lice? - in detail
Lice infestation becomes apparent through specific signs on the scalp and surrounding hair. The primary indicator is the presence of live insects, which are small, wing‑less, and move quickly. Adult lice measure about 2–3 mm in length and have a grayish‑brown coloration; they can be seen crawling on the hair shaft or clinging to the scalp.
Secondary clues include:
- Nits attached firmly to the base of hair strands, typically within ¼ inch of the scalp. Nits appear as oval, white or yellowish shells and do not detach easily when brushed.
- Persistent itching caused by the bite of the parasite. Scratching may lead to secondary skin irritation or small sores.
- Small blood spots on the hair or pillowcase, resulting from lice feeding.
- Visible movement of insects when the hair is examined under bright light or after the scalp is warmed.
A systematic inspection can confirm infestation:
- Separate a small section of hair near the crown, where lice favor warm, protected areas.
- Use a fine‑toothed comb specifically designed for lice detection; comb the hair slowly from root to tip.
- Examine the comb after each pass on a white surface; live lice will be seen moving, while nits remain attached to the comb teeth.
- Repeat the process across multiple sections, especially behind the ears and at the nape of the neck.
If any of the above signs are observed, immediate treatment is recommended to prevent spread. Early detection reduces the likelihood of extensive colonization and minimizes discomfort.