How do I know if I have dandruff or knits?

Dandruff or nits. Both nits and dandruff cause itching of the scalp, but the similarities stop there. The causes of nits and dandruff, as well as the treatments to treat these conditions are vastly different. Nits are the eggs of lice. Dandruff is simply dry skin on the scalp. Nits are not on the scalp but on the hair shaft.