Pictures of LiceAn itchy scalp caused by head lice bites and frequent scratching behind the ears is often the first thing parents notice. Head lice feed several times a day. They cannot survive for more than a day or two without a blood meal. Usually as soon as someone starts talking about head lice, people start scratching. That doesn't mean you have lice. A tickling feeling, as if something is crawling around in your hair is usually a good indication that you have head lice. Sores on the head can be a sign of head lice because of all the scratching that you do. Have someone check you under a strong light. You can call 1-888-LICENDERS and we will be glad to assist you.