Dandruff is a common scalp condition that causes flaking and sometimes itching. It can be mild and occasional, or it may be more persistent and noticeable. Dandruff is not caused by poor hygiene, and it is not usually dangerous, but it can be uncomfortable, frustrating, or embarrassing. Dandruff may overlap with a skin condition called seborrheic dermatitis. Dandruff may be considered the mildest form of seborrheic dermatitis, and both can cause white-to-yellowish scaling. Wh