Dandruff is a very common skin condition that nearly all people experience at some point in their lives regardless of age or ethnicity. It affects not just the scalp, but also the ears, eyebrows, sides of the nose, beard, and less commonly, the central (often hair-bearing) part of the chest. Dandruff can affect any hair-bearing area or an area with even very small hair follicles.
Dandruff is seen in all ages from babies to the elderly. In infancy, scalp dandruff is commonly known as "cradle cap." In the teen years, it has been called "druff" for short.
Some people are simply more prone to dandruff, and others experience periodic clearing cycles and periodic flare-ups of the condition.