http://ping.fm/4hJzl How can you be convinced if your minor has head lice? You have spotted them itching or maybe you see something in their hair. However how do you know if it is lice and how do you clear away them? Head lice are human parasites that feed on small quantities of blood that is shown from the scalp. They are most most likely seen however not constrained to children somewhere between the ages of 3 to 12.