Seborrheic dermatitis is a common, inflammatory skin condition that causes flaky, white to yellowish scales to form on the sebaceous-gland-rich areas of skin. In adolescents and adults, seborrhoeic dermatitis usually presents as scalp scaling similar to dandruff or as mild to marked erythema of the nasolabial fold. It can occur with or without reddened skin. Cradle cap is the term used when Seborrheic dermatitis affects the scalp of infants. Seborrhoeic dermatitis is caused by seborrhea, a pathologic overproduction of sebum, and subsequent infection and inflammation.
cause of seborrheic dermatitis : Skin lesions, Plaques over large area, Greasy, oily areas of skin, Skin scales - white and flaking, or yellowish, oily, and adherent - 'dandruff', Itching - may become more itchy if infected, Mild redness, Hair loss