What happens if you leave head lice untreated?
Have you ever wondered what happens if you leave head lice untreated and what the long-term effects of untreated head lice can be?
Feb 21, 2026 · 4 min read
TL;DR
Untreated head lice keep multiplying. Itching can worsen, and the infestation can spread to family and contacts. In rare cases, scratching can lead to skin infection. Treat early to avoid discomfort and spread.
Untreated head lice complications
Without treatment, female lice lay eggs daily. Within weeks, a small infestation can become large. Itching may increase, and constant scratching can cause sores or secondary bacterial infection.
Why treat promptly?
Early treatment is simpler and stops lice from spreading to others. Use silicone- or oil-based products or wet combing, and repeat after 7–10 days. For stubborn cases, see a professional clinic.