What should not be done if you have lice? - briefly
Do not rely on ordinary shampoo, conditioner, or hair styling products to eliminate the infestation; they lack insecticidal properties. Avoid scratching, applying excessive heat, or using petroleum‑based substances, as these can harm the scalp without killing the parasites.
What should not be done if you have lice? - in detail
When lice are present, certain actions worsen the situation or pose health risks.
Avoid using oily substances such as mayonnaise, petroleum jelly, or hair‑conditioner treatments. These products coat the insects, making them harder to detect and preventing pediculicides from reaching the scalp.
Do not apply heat sources, including hair dryers set on high temperature, hair straighteners, or heated caps. Excessive heat can cause scalp burns without reliably killing the parasites.
Refrain from shaving the head as a primary solution. Shaving may remove some insects, but it does not eliminate nits attached to hair shafts and can create skin irritation.
Do not rely on over‑the‑counter shampoos or soaps that lack proven insecticidal ingredients. Products containing only soap or mild detergents lack efficacy and may give a false sense of security.
Skip the practice of “smothering” with petroleum‑based oils combined with a plastic cap for extended periods. This method can cause scalp irritation, allergic reactions, and does not guarantee complete eradication.
Do not share personal items such as combs, hats, pillowcases, or towels until all insects and eggs have been removed and the items have been washed in hot water (≥130 °F) or sealed in a plastic bag for two weeks.
Avoid using insecticide sprays or foggers in the living environment. These chemicals are intended for insects that fly or crawl on surfaces, not for head lice, and can contaminate indoor air and surfaces.
Do not postpone treatment while waiting for symptoms to subside. Lice reproduce quickly; delayed action leads to larger infestations and increased transmission risk.
In summary, steer clear of oily coatings, high heat, shaving, ineffective shampoos, prolonged smothering, sharing personal items, indoor insecticide sprays, and delayed intervention. Following these avoidance guidelines, combined with approved pediculicide treatment and thorough nit removal, yields the most reliable outcome.