How bad can headlice get?
A female louse can lay 30 eggs a day which hatch from 7-10 days
so if you have lets say 5 lice, in 7-10 days you will have 150. If
an infestation is severe they can keep biting the scalp until it
bleeds and the broken skin can get dirty which would cause an
infection in the skin of the scalp.