Paranix treatments are specially developed to get rid of head lice and their eggs. In the event of a severe infestation, some eggs could still hatch after your first treatment, so you might have nymphs or baby head lice in your hair. There is no need to worry, as these nymphs only become mature after 10 days. Before that time, they feed on blood to live, but are not yet able to reproduce. Treat your hair a second time, and all head lice and eggs will be gone.
It’s also possible that your hair may have been re-infested. This is probably the case if you find mature head lice of more than 2mm because nymphs are smaller than mature head lice. lf this louse is female, she may have laid eggs again. In that case you need to start treating your hair with Paranix again.