real photo of head lice. adult head louse with nymfa head louse on human hair above white background. pediculus capitis

louse insect animal head hair blood disease pest human health sucking bite bug macro nature parasite closeup infection medical microscope treatment care isolated hygiene shampoo school small scalp infestation child irritations dermatology diagnosis healthcare illness prevention skin schoolchild insecticide unhygienic pharmacy bloodfeeding bloodsucker