HEAD LICE - Small parasitic insects that can cause an itching red rash to the skin of the waist, shoulders, armpits, neck, and pubic area. Commonly spread from person-to-person via close contact. The eggs (nits) of head lice can be mistaken for dandruff, but they are adherent to the hair shafts. Symptoms include itching, eggs visible on hair shafts, and lice on hair, scalp, or clothing. Treatment requires the use of a special prescription insecticide (Kwell) shampoo and/or lotion.