Head lice/nits
Lice are tiny brown mites that move around the hair and scalp. Nits are the eggs, which are tiny and white and cling to the hair. These will hatch within a week, and become lice (which are active for several weeks).
Itchy scalp and evidence of lice and nits on close inspection of the hair.
Buy a solution and nit comb from your chemist and follow the instructions carefully (including washing of clothes, bedding and hairbrushes in very hot water). Treat the whole family. Your child can return to school/day care centre the next day. Notify your school/day care centre to be on the watch for other outbreaks.