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Chronic inflammatory skin condition causing redness, greasy, flaky scales in areas rich in oil glands, including the face, scalp, body folds; managed with antifungal and anti-inflammatory therapies.
Seborrheic dermatitis is a common, chronic inflammatory skin condition that primarily affects areas of the body where sebaceous (oil-producing) glands are most concentrated. The face is among the most frequently involved sites, with inflammation commonly appearing in the nasolabial folds, on the eyebrows, around the eyelids, and on the glabella. The scalp, ears, central chest, and skin folds are also commonly affected. The condition is characterised by redness, greasy or flaky scales, and itching.
Seborrheic dermatitis is not contagious and does not cause permanent skin damage, but it can be persistent and may significantly affect quality of life. It tends to follow a relapsing and remitting course, with periods of flare alternating with periods of relative clearance. Symptoms may worsen during periods of stress, illness, or seasonal changes, and tend to improve during warmer, more humid months.
Seborrheic dermatitis affects an estimated two to five percent of the general population, with higher rates observed in immunocompromised individuals. It can occur at any age and is more prevalent in males. Peak incidence occurs in young adulthood and middle age.
The precise cause of seborrheic dermatitis is not fully understood; however, several contributing factors have been identified. The condition is strongly associated with the presence of Malassezia yeast, a genus of fungi that naturally colonises the skin surface. In susceptible individuals, an abnormal immune response to Malassezia and its metabolic by-products is thought to trigger inflammation and accelerated skin cell turnover, leading to the characteristic scaling and redness.
Several factors are known to increase the risk of developing or exacerbating seborrheic dermatitis:
The clinical presentation of seborrheic dermatitis varies depending on the body site involved. The condition predominantly affects sebaceous gland-rich areas of the skin. Common features include:
Seborrheic dermatitis should be distinguished from psoriasis, atopic dermatitis, rosacea, and contact dermatitis, all of which can produce overlapping features on the face and scalp.
Seborrheic dermatitis is primarily a clinical diagnosis, established through a thorough history and physical examination. A dermatologist will assess the distribution and appearance of scaling, redness, and associated symptoms. The characteristic involvement of sebaceous gland-rich areas, combined with the greasy quality of the scales, typically distinguishes seborrheic dermatitis from other conditions with similar presentations.
In cases where the diagnosis is uncertain, additional investigations may be considered, including skin scrapings for fungal examination or a skin biopsy to evaluate histological features.
In individuals presenting with severe or refractory seborrheic dermatitis, screening for underlying conditions such as HIV infection may be recommended, as significantly worsened disease can be an indicator of immunosuppression.
While seborrheic dermatitis cannot be permanently cured, it can be effectively managed with a combination of antifungal and anti-inflammatory therapies. Treatment is tailored to the affected site, the severity of the condition, and the individual patient's response. The goals of treatment are to reduce scaling, relieve itching, and achieve prolonged remission.
For facial and body involvement, topical antifungal creams or foams containing ketoconazole or ciclopirox are commonly prescribed. These agents reduce the Malassezia burden on the skin and help to resolve inflammation.
For scalp involvement, medicated shampoos containing ketoconazole, selenium sulphide, zinc pyrithione, coal tar, or salicylic acid are the cornerstone of treatment. Shampoos are generally applied several times per week during active flares and then reduced to a maintenance frequency once symptoms are controlled.
Low-potency topical corticosteroids are frequently used in combination with antifungal agents to reduce inflammation and itching, particularly during flares. These are generally prescribed for short-term use due to the potential for side effects with prolonged application, including skin thinning and, on the face, rosacea-like changes.
Topical calcineurin inhibitors such as tacrolimus and pimecrolimus offer an alternative anti-inflammatory approach, particularly for facial seborrheic dermatitis where long-term corticosteroid use is not recommended. These agents modulate the immune response without causing skin atrophy.
Given the chronic, relapsing nature of seborrheic dermatitis, ongoing maintenance therapy is often necessary. Once active disease has been controlled, intermittent use of antifungal agents on a weekly or biweekly basis can help to prevent recurrence. Patients are also advised to identify and minimise personal triggers, including stress, and to use gentle, non-irritating skincare products. Prescription management of topical and systemic therapies is available at the Centre for Medical and Surgical Dermatology.
Medical assessment is recommended when scaling and redness do not improve with over-the-counter treatments after several weeks of regular use. Evaluation by a dermatologist is also advisable when symptoms are severe, widespread, or accompanied by significant discomfort; when facial skin is involved; when there is concern about secondary bacterial infection; or when the diagnosis is uncertain.
A board-certified dermatologist can provide an accurate diagnosis, rule out other conditions with similar appearances, and develop a personalised treatment plan. At the Centre for Medical and Surgical Dermatology, Dr. Maksym Breslavets provides comprehensive assessment and management of seborrheic dermatitis and other chronic skin conditions. A referral from a family physician is typically required to access dermatology services.
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