What lice look like – Adult lice are small, about 2-3 mm in size. You rarely see the bugs (unless it’s a heavy infestation) as they crawl quickly and hide from the light. On average people have head lice 3-4 weeks before it’s discovered. Want to check for head lice? Here’s a FREE guide on how to check for head lice. And check out how to get rid of head lice in your home.
See more pictures of lice & nits.