A medical problem more common since the development of “resistant” strains of lice.
The head louse is a blood-sucking parasite about 3mm long, greyish, but adapting to the hair colour of its host. The tiny, pearly eggs or “nits” are cemented to the hair close to the scalp and there are three nymphal stages. The eggs hatch in about eight days and the complete life cycle takes about 18 days.
The bites cause inflammation and itching, which leads to affected children scratching the scalp, introducing secondary infections such as impetigo or eczema, or literally feeling lousy.