Definition
Dandruff is a common scalp condition that causes flaky skin to appear on the scalp and in the hair. Think of it as your scalp shedding its skin a little too much. It's often caused by a yeast-like fungus called Malassezia. It can also be triggered by dry skin or certain skin conditions. It's usually not serious, but it can be annoying and sometimes itchy. It's easily treatable with special shampoos.