MSD Manual

Please confirm that you are a health care professional

Loading

Seborrheic Dermatitis

By

Mercedes E. Gonzalez

, MD, University of Miami Miller School of Medicine

Last full review/revision Aug 2019| Content last modified Aug 2019
Click here for Patient Education
NOTE: This is the Professional Version. CONSUMERS: Click here for the Consumer Version
Topic Resources

Seborrheic dermatitis (SD) is inflammation of skin regions with a high density of sebaceous glands (eg, face, scalp, upper trunk). The cause is unknown, but species of Malassezia, a normal skin yeast, play some role. SD occurs with increased frequency in patients with HIV and in those with certain neurologic disorders. SD causes occasional pruritus, dandruff, and yellow, greasy scaling along the hairline and on the face. Diagnosis is made by examination. Treatment is tar or other medicated shampoo and topical corticosteroids and antifungals.

Despite the name, the composition and flow of sebum are usually normal. The pathogenesis of seborrheic dermatitis is unclear, but its activity has been linked to the number of Malassezia yeasts present on the skin. Seborrheic dermatitis occurs most often in infants, usually within the first 3 months of life, and in adults aged 30 to 70 years. The incidence and severity of disease seem to be affected by genetic factors, emotional or physical stress, and climate (usually worse in cold weather). SD may precede or be associated with psoriasis (called seborrhiasis). SD may be more common and more severe among patients with neurologic disorders (especially Parkinson disease) or HIV/AIDS. Very rarely, the dermatitis becomes generalized.

Symptoms and Signs

Symptoms of seborrheic dermatitis develop gradually, and the dermatitis is usually apparent only as dry flakes (dandruff) or greasy diffuse scaling of the scalp (dandruff) with variable pruritus. In severe disease, yellow-red scaling papules appear along the hairline, behind the ears, in the external auditory canals, on the eyebrows, in the axillae, on the bridge of the nose, in the nasolabial folds, and over the sternum. Marginal blepharitis with dry yellow crusts and conjunctival irritation may develop. SD does not cause hair loss.

Newborns may develop SD with a thick, yellow, crusted scalp lesion (cradle cap); fissuring and yellow scaling behind the ears; red facial papules; and stubborn diaper rash. Older children and adults may develop thick, tenacious, scaly plaques on the scalp that may measure 1 to 2 cm in diameter.

Manifestations of Seborrheic Dermatitis

Diagnosis

  • Clinical evaluation

Diagnosis of seborrheic dermatitis is made by physical examination.

Seborrheic dermatitis may occasionally be difficult to distinguish from other disorders, including psoriasis, atopic dermatitis or contact dermatitis, tinea, and rosacea.

Treatment

  • Topical therapy with antifungals, corticosteroids, and calcineurin inhibitors

Adults and older children

In adults with involvement of the scalp, zinc pyrithione, selenium sulfide, sulfur and salicylic acid, ketoconazole (2% and 1%), and tar shampoo (available over the counter) should be used daily or every other day until dandruff is controlled and twice/week thereafter. A corticosteroid lotion (eg, 0.01% fluocinolone acetonide solution, 0.025% triamcinolone acetonide lotion) can be rubbed into the scalp or other hairy areas twice daily until scaling and redness are controlled.

For seborrheic dermatitis (SD) of the postauricular areas, nasolabial folds, eyelid margins, and bridge of the nose, 1 to 2.5% hydrocortisone cream is rubbed in 2 or 3 times daily, decreasing to once a day when SD is controlled; hydrocortisone cream is the safest corticosteroid for the face because fluorinated corticosteroids may cause adverse effects (eg, telangiectasia, atrophy, perioral dermatitis). In some patients, 2% ketoconazole cream or other topical imidazoles applied twice daily for 1 to 2 weeks induce a remission that lasts for months. An imidazole or hydrocortisone can be used as first-line therapy; if necessary, they can be used simultaneously. Calcineurin inhibitors (pimecrolimus and tacrolimus) are also effective particularly when long-term use is necessary. For eyelid margin seborrhea, a dilution of 1 part baby shampoo to 9 parts water is applied with a cotton swab.

Infants and children

In infants, a baby shampoo is used daily, and 1 to 2.5% hydrocortisone cream or fluocinolone 0.01% oil can be used once to twice daily for redness and scaling on the scalp or face. Topical antifungals such as ketoconazole 2% cream or econazole 1% cream can also be helpful in severe cases. For thick lesions on the scalp of a young child, mineral oil, olive oil, or a corticosteroid gel or oil is applied at bedtime to affected areas and rubbed in with a toothbrush. The scalp is shampooed daily until the thick scale is gone.

Key Points

  • In adults, seborrheic dermatitis causes dandruff and sometimes scaling around the eyebrows, nose, and external ear, behind the ears, in the axilla, and on the sternum.

  • Seborrheic dermatitis can cause a thick, yellow, crusted scalp lesion in newborns or thick, scaly scalp plaques in older children and adults.

  • Treatments can include medicated shampoos and topical corticosteroids.

Click here for Patient Education
NOTE: This is the Professional Version. CONSUMERS: Click here for the Consumer Version
Professionals also read

Also of Interest

SOCIAL MEDIA

TOP