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Dandruff is a skin condition that causes flakes of dead skin from the scalp to appear in the hair. A typical feature of this condition is a sensation of itchiness in areas of the scalp. The condition is not an infection and cannot spread from one person to another. Although dandruff does not cause any long term harm, it can be uncomfortable to live with and causes a person embarrassment.
It is normal for the skin to shed dead skin cells as new ones form but this usually happens gradually and is not noticeable. In the case of dandruff, however, this process is accelerated and visible deposits of the dead cells start to form. The exact causes of dandruff are not understood but a condition called seborrhoeic dermatitis which causes oily skin has been suggested as a cause. Seborrhoeic dermatitis affects sebaceous-rich areas of the skin such as the scalp, face and torso and is thought to be caused by an inflammatory reaction to the yeast called Malassezia.
Some factors that can make dandruff worse include the over-use of hairspray and hair gel, the winter season, and emotional stress. Dandruff symptoms range from mild to severe and the condition affects half of all people at some point in their lifetime. Dandruff often develops after puberty and is commonly found among people in their 20s and older. Dandruff is thought to be more common in men than in women.
Some of the clinical features of dandruff include:
A doctor usually diagnoses dandruff based on the redness and scaling of the scalp. Mild dandruff can usually be resolved by washing the hair daily with a mild shampoo and refraining form itching the scalp or using any hairspray or similar products on the hair.
More severe dandruff is usually treated with an antidandruff shampoo. There are many different shampoos available over-the counter that have different mechanisms of action. Shampoos containing zinc pyrithione kill the Malassezia fungi, while salicylic acid helps to soften and shed dead skin cells and selenium sulfide slows the production of skin cells as well as killing the fungi.
In cases where the shampoo fails to resolve the dandruff, a steroid cream or ointment may be prescribed to relieve symptoms. The patient may be prescribed an antifungal agent to use in combination with the steroid cream.