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The exact cause of dandruff is unknown. Possible causes and associations include increased oil production and secretion, and increased numbers of normal skin yeasts.
Bacteria have not been found to cause dandruff. Dandruff is not a fungal infection and is not the same as scalp "ringworm," which is actually a fungal infection called tinea capitis. Dandruff is not contagious.
Dandruff may also be triggered or made worse by poor hygiene and infrequent shampooing and washing. The immune system may also play a role in dandruff. Although mild dandruff is a very common condition in many people with a normal immune system, severe dandruff is more common in people with some chronic illnesses such as Parkinson' s disease or a compromised immune system as in advanced HIV/AIDS.
Medically Reviewed by a Doctor on 8/13/2015
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