What are the Symptoms of Head Lice Infestation?
Head lice are transmitted through close contact with the infested person or by using any of his personal items, like hairbrush, hat, pillow, bed, etc. Head lice may not cause any symptoms for two to three months, after they have started to spread. The most common head lice symptom is an itchy scalp, but it may be totally absent in some people. It is believed that itching is caused by the saliva of the lice, that is injected into the scalp, while feeding on human blood. The immune system of the human body, releases some chemicals to counteract the saliva, which is a foreign body. The action of these chemicals at the site in the scalp causes itching. But itching may occur after three or four months of infestation. Symptoms of head lice infestation include sores, which can be red and pustular. Normally, these sores are harmless, but may become sites for bacterial infections. Such sores are caused by the excessive scratching of the scalp, due to itching. Apart from itching and sores, the i