Head lice are tiny insects that live among human hair and feed on blood pulled out from the scalp. They are extremely annoying, contagious, and quite difficult to remove! As for their spreading, they are spread by personal contact or sharing of caps, brushes, or combs.
They are known to cause itching, a feeling of something moving on the head, and sometimes even sores on the scalp. Even though itching might indicate a lice infestation, most people are asymptomatic. It is important to mention that the presence of a live louse or the presence of nits is the only reliable sign of lice infestation.
- BestHealthyGuide.com