Seborrheic dermatitis and scalp psoriasis both have the excessive flaking of scales appearing like severe dandruff. However, seborrheic dermatitis has much less redness on the scalp and no red raised areas. Scalp itch is common and may also occur on the forehead and behind the ears, where a high number of seborrheic oil glands exist.
Seborrheic dermatitis causes flaking of the skin, commonly causing it to look greasy and scaly. It usually affects the scalp, but can also affect the skin on other parts, such as the face and chest. In adults, it is commonly called "dandruff," while in babies it is referred to as "cradle cap."
The cause of this condition is unknown, although many factors have been implicated. The ubiquitous yeast, Malassezia furfur (formerly known as Pityrosporum ovale) is involved, as well as genetic, environmental, hormonal, and immune-system factors. It has been suggested that seborrheic dermatitis is an inflammatory response to this organism, but this has yet to be proven.
Symptoms include dryness, itchiness and flakes.
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