Hair Loss Glossary
					Dandruff What is dandruff? Skin constantly renews itself by shedding the outer layer of cells as new cells push up from beneath. This shedding is normal, and most of the time it's unnoticeable. When flakes of sloughed-off skin from the scalp become obvious or are accompanied by itchiness, it's called dandruff. Dandruff can occur in all age groups. If your dandruff persists despite treatment, or if you have very large flakes together with symptoms around your nose, ears or chest, you may have seborrheic dermatitis. Sometimes referred to as seborrhea, this greasy, scaly, itchy rash can occur on the sides of your nose, in and between your eyebrows, behind your ears, in the center of your chest, or around your navel or genitals as well as in the scalp. Or severe dandruff may be the result of psoriasis of the scalp. What causes it? Contrary to popular notions, dandruff is usually a result of too much oiliness of the skin and scalp rather than dryness. While mild dandruff may be caused by overactive oil glands, recent evidence suggests that the more severe dandruff associated with seborrheic dermatitis may be caused by an overabundance of Pityrosporum ovale, a yeast-like organism found on healthy scalp in low numbers. With the increased scaling and oiliness of seborrheic dermatitis, these yeast organisms thrive and multiply, aggravating inflammation and scaling.
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