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Knowing the difference between lice and dandruff can help heal your scalp condition properly. Lice are infectious parasites and dandruff is a self-contained scalp condition. Dandruff comes from the head, and flakes off. Dandruff is due to the excessive shedding of dead skin cells from the scalp, and lice are wingless insects (small bugs) that infest the hair and scalp. The methods of prevention and treatment also vary between lice and dandruff.
Causes. Head lice infect hair on the head. Tiny eggs on the hair look like flakes of dandruff. However, instead of flaking off the scalp, they stay in place. Head lice can live up to 30 days on a human. Their eggs can live for more than 2 weeks. Head lice spread easily, particularly among school children.