280 likes | 1.24k Views
Seborrheic dermatitis. Dr. Majdy Naim. Seborrheic dermatitis. a papulosquamous disorder patterned on the sebum-rich areas of the scalp, face, and trunk In addition to sebum, this dermatitis is linked to Malassezia, immunologic abnormalities, and activation of complement.
E N D
Seborrheic dermatitis Dr. Majdy Naim
Seborrheic dermatitis • a papulosquamous disorder patterned on the sebum-rich areas of the scalp, face, and trunk • In addition to sebum, this dermatitis is linked to Malassezia, immunologic abnormalities, and activation of complement
Commonly aggravated by changes in humidity, changes in seasons, trauma (eg, scratching), or emotional stress. • The severity varies from mild dandruff to exfoliative erythroderma.
Pathophysiology • normal levels of Malassezia but an abnormal immune response
Age • The usual onset occurs with puberty. • It peaks at age 40 years and is less severe, but present, among older people. • In infants, it occurs as cradle cap or, uncommonly, as a flexural eruption or erythroderma.
Frequency :3-5 %, dandruff 15-20% • Race: Seborrheic dermatitis occurs in persons of all races. • Sex: The condition is slightly worse in males than in females.
Scalp appearance varies from mild, patchy scaling to widespread, thick, adherent crusts • Skin lesions manifest as greasy scaling over red, inflamed skin • Distribution follows the oily and hair-bearing areas of the head and the neck, such as the scalp, the forehead, the eyebrows, the lash line, the nasolabial folds, the beard, and postauricular skin.
Treatment • Topical corticosteroids • Dandruff responds to more frequent shampooing • Selenium sulfide (2.5%), ketoconazole, and ciclopirox shampoos may help by reducing Malassezia yeast scalp reservoirs