How long should kerosene stay on hair for lice treatment? - briefly
«Kerosene» should not be used for lice eradication; if applied, exposure must not exceed 5‑10 minutes before thorough washing with soap and water. Prolonged contact increases risk of skin irritation and systemic toxicity.
How long should kerosene stay on hair for lice treatment? - in detail
Kerosene is occasionally employed as a pediculicidal agent due to its ability to suffocate lice and nits. Scientific and medical literature does not endorse a standardized exposure interval, but practical guidance converges on a short, controlled contact time to balance efficacy with safety.
The recommended contact period ranges from five to ten minutes. Application for less than five minutes may leave viable insects, while exposure beyond ten minutes increases the risk of scalp irritation, chemical burns, and systemic toxicity. After the designated interval, the kerosene should be thoroughly rinsed with warm water and a mild surfactant to remove residual oil.
Key considerations for safe use:
- Perform a patch test on a small scalp area 24 hours before full application; discontinue if redness, itching, or swelling appears.
- Apply the oil evenly, ensuring coverage of hair shafts and roots without saturating the scalp.
- Maintain the exposure time with a timer; do not exceed ten minutes under any circumstances.
- After rinsing, wash the hair with a gentle shampoo to eliminate remaining kerosene and reduce irritation.
- Avoid use on children under two years, pregnant or lactating individuals, and persons with known skin sensitivities.
Potential adverse effects include dermatitis, folliculitis, and accidental ingestion. In case of severe reaction, rinse the scalp immediately with copious water and seek medical attention.
Given the narrow therapeutic window, many health professionals recommend alternative, FDA‑approved treatments—such as permethrin or dimethicone—that provide proven efficacy with lower risk profiles. If kerosene is chosen, strict adherence to the five‑to‑ten‑minute exposure window is essential for optimal outcomes.