Seborrhoeic Dermatitis

Understanding Seborrhoeic Dermatitis

Seborrhoeic dermatitis is a widespread, chronic inflammatory skin condition that principally manifests on regions of the body abundant in sebaceous glands. These glands are responsible for producing sebum, an oily substance that lubricates the skin and hair. When affected by seborrhoeic dermatitis, these areas typically exhibit redness, scaling, and itching.

While not contagious or life-threatening, seborrhoeic dermatitis can be persistent and may impact an individual's quality of life due to its visible symptoms.

Causes and Contributing Factors

The precise cause of seborrhoeic dermatitis is not fully understood, but it is believed to involve a combination of genetic and environmental factors. A key contributing factor is the overgrowth of Malassezia yeast, a type of fungus naturally present on the skin. In individuals with seborrhoeic dermatitis, this yeast can proliferate excessively, leading to an inflammatory response.

Other factors that can exacerbate or trigger flare-ups include:

• Hormonal fluctuations: Androgens, a group of hormones, can stimulate sebaceous gland activity.
• Stress: Psychological stress can worsen symptoms.
• Neurological conditions: Conditions such as Parkinson's disease and stroke have been linked to increased incidence.
• Weakened immune system: Individuals with compromised immune systems, including those with HIV/AIDS, are more susceptible.
• Medications: Certain drugs, like psoralen, interferon, and lithium, can trigger or worsen the condition.
• Cold, dry weather: These environmental conditions can dehydrate the skin, potentially leading to increased flaking and irritation.
• Infrequent shampooing: Allows for sebum and yeast buildup.
• Alcohol-based lotions: These can dry out the skin and irritate existing conditions.

Symptoms and Presentation

Seborrhoeic dermatitis can appear in various forms and affects different age groups. The most common symptoms include:

• Redness (Erythema): Affected skin areas often appear red and inflamed.
• Scaling: Flaky skin, which can be white or yellowish and oily-looking.
• Itching: Can range from mild to intense.
• Greasy patches: Skin may have an oily or greasy appearance.
• Crusting: In some severe cases, crusts may form on the affected areas.

In adults, seborrhoeic dermatitis commonly affects the scalp, eyebrows, sides of the nose, ears, and chest. On the scalp, it manifests as stubborn, oily or dry scales that can be accompanied by itching. In severe cases, hair loss may occur, though it is often temporary. On facial skin, it can cause redness and greasy scales around the nose, eyebrows, and forehead.

In infants, the condition is known as "cradle cap" and typically presents as thick, greasy, yellowish scales on the scalp. It is generally harmless and resolves on its own within a few months.

Diagnosis

Diagnosis is usually made by a visual examination of the skin by a healthcare professional. In some cases, a skin biopsy may be performed to rule out other conditions such as psoriasis or fungal infections.

Management and Treatment

The goal of treatment is to control symptoms and reduce inflammation. As seborrhoeic dermatitis is a chronic condition, management often involves ongoing care to prevent flare-ups.

Scalp Care

For the scalp, regular shampooing with specific formulations is key. Look for shampoos containing active ingredients such as:

• Selenium sulfide: Works to slow down the growth of Malassezia yeast and reduce cell turnover.
• Zinc pyrithione: An antifungal and antibacterial agent that helps control yeast and bacteria on the scalp.
• Ketoconazole: A broad-spectrum antifungal that is highly effective against Malassezia.
• Coal tar: Reduces inflammation and slows skin cell growth.
• Salicylic acid: Helps to soften and remove scales.

It is often recommended to alternate between shampoos with different active ingredients to prevent the yeast from developing resistance.

Skin Care

For other affected areas of the body, topical treatments are commonly used:

• Antifungal creams: Creams containing ketoconazole or ciclopirox can help control yeast overgrowth.
• Corticosteroid creams: Mild topical corticosteroids can reduce inflammation and itching, but prolonged use should be avoided due to potential side effects like skin thinning.
• Calcineurin inhibitors: Topical pimecrolimus and tacrolimus can be used to manage inflammation, particularly on the face, and are alternatives to corticosteroids.

Lifestyle Adjustments

Making certain lifestyle adjustments can also help manage seborrhoeic dermatitis:

• Gentle cleansing: Use mild, non-drying cleansers on affected skin.
• Moisturising: Apply a light, non-comedogenic moisturiser, especially after washing, to prevent dryness.
• Avoid irritants: Steer clear of harsh soaps, alcohol-based products, and hair sprays that can exacerbate symptoms.
• Stress management: Techniques such as meditation, yoga, or exercise can help reduce stress levels, which may in turn reduce flare-ups.
• Sun exposure: Limited, controlled exposure to natural sunlight may help improve symptoms, but excessive sun exposure should be avoided due to the risk of skin damage.

Prevention

While complete prevention may not be possible due to the chronic nature of the condition, consistent management can help minimize flare-ups. Regular use of anti-dandruff shampoos and appropriate skincare for affected areas are crucial.

Treatment Type	Primary Action	Common Active Ingredients
Antifungals	Reduce yeast	Ketoconazole, Selenium Sulfide, Zinc Pyrithione
Keratolytics	Remove scales	Salicylic Acid, Coal Tar
Anti-inflammatories	Reduce redness & itching	Mild Corticosteroids, Calcineurin Inhibitors

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Find these ingredients in Watermans products

• Zinc — you will find this ingredient in our Hair Vitamins.