head lice and nits on brown human hair, anoplura, medical conditions, personal hygiene, children's health, parasites,

lice hair nits itches parasites pest bug bloodsucker laundered itch louse insect little bite background disease head animal medicals health care haircut nature macro flea fauna parasite human treatment closeup infection scalp itchy scratching infestation medical condition hygiene medication diagnosis spread anoplura siphunculata phthiraptera pediculosis