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Seborrheic dermatitis is thought to be due to a combination of an over production of skin oil and irritation from a yeast called malessizia. Seborrheic dermatitis appears to run in families.
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The cause of seborrheic dermatitis is unclear, though it is has been linked to genetic or environmental factors. Pityrosporum ovale, a species of yeast normally found in hair follicles, has been proposed as one possible causative factor.
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As of 2004 the cause of seborrheic dermatitis was not clear. However, it is not an infection or an allergy, it is not contagious, and it is not caused by poor hygiene.
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Dandruff is easy to diagnose. The condition is characterized by the appearance of white flakes on the hair or on the shoulders and collar.
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