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Seborrheic dermatitis is a common, inflammatory skin condition that causes flaky, white to yellowish scales to form on oily areas such as the scalp or inside the ear. It can occur with or without reddened skin.
Cradle cap is the term used when seborrheic dermatitis affects the scalp of infants.
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. Stress, fatigue, weather extremes, oily skin, infrequent shampoos or skin cleaning, use of lotions that contain alcohol, skin disorders (such as acne), or obesity may increase the risk.
Neurologic conditions, including Parkinson's disease , head injury , and stroke may be associated with seborrheic dermatitis. Human immunodeficiency virus (HIV) has also been linked to increased cases of seborrheic dermatitis.
Habif TP. Clinical Dermatology . 4th ed. St. Louis, Mo: Mosby; 2004:242-245.
Noble J. Textbook of Primary Care Medicine . 3rd ed. St. Louis, Mo: Mosby; 2001:762-764.
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