What is seborrheic dermatitis and how to manage it?

• Seborrheic dermatitis is a chronic inflammatory skin disease affecting areas with a high concentration of sebaceous glands. The primary cause is the abnormal growth of the Malassezia fungus on the skin, along with other triggers such as stress, a weakened immune system, and changing weather conditions.
• Symptoms of seborrheic dermatitis include red, itchy rashes with scaly or yellowish-white, shiny flakes resembling dandruff. It is commonly found on the scalp, hairline, eyebrows, nasolabial folds, behind the ears, and chest.
• This disease is incurable; treatment focuses on managing symptoms during flare-ups. This often involves topical anti-inflammatory steroids (short-term use), antifungal creams or shampoos, and moisturizing.
• Prevention of flare-ups can be achieved through adequate rest, managing stress, cleansing with gentle products, avoiding hot water, and consuming foods and alcohol that trigger inflammation.

Many people experience problems like flaky skin, red rashes around the nose, or persistent dandruff on the scalp. These symptoms may not just be due to dry skin, but could be signs of seborrheic dermatitis, a chronic skin disorder that often occurs in oily areas with many sebaceous glands. It presents as red rashes with white or yellow scales and is itchy. So how do you properly care for and prevent it? This article has the answers!

What is Seborrheic Dermatitis?

Seborrheic dermatitis, or sebaceous gland allergy, is a chronic inflammatory skin disease that often occurs in areas with a high concentration of sebaceous glands, such as the scalp, hairline, face, eyebrows, sides of the nose, behind the ears, and chest. It is not contagious and cannot be cured, but flare-ups can be controlled.

Symptoms of seborrheic dermatitis include red rashes with shiny yellow or white scales, itching, flaking, or dandruff on the scalp. Flare-ups often occur when the body is weakened, stressed, sleep deprived, or exposed to changes in weather.

What causes seborrheic dermatitis?

• Stress
• Insufficient sleep
• Dry skin
• Frequent face washing
• Excessive sun exposure
• Alcohol consumption
• Eating very hot food or drinks
• A family history of the disease or pre-existing immune or nervous system disorders such as Parkinson's disease or HIV infection.
• Malassezia (Malassezia) is an abnormal growth of this yeast on the skin.
• Irritating skin products can also contribute to seborrheic dermatitis.

Excessive oil and sebaceous gland activity can also cause seborrheic dermatitis.

Malassezia is a type of yeast that naturally lives on human skin, particularly in areas with high sebaceous gland concentrations such as the scalp, face, and chest. This fungus feeds on the sebum produced by the skin.

This fungus is indeed one of the triggers for seborrheic dermatitis. When the body produces excessive oil or the skin's environment changes, Malassezia grows and multiplies rapidly. The body's immune system responds to the substances produced by the fungus, resulting in inflammation, redness, scaling, and itching of the skin.

What are the symptoms of seborrheic dermatitis?

• Red rashes appear on the forehead, cheeks, eyebrows, or scaly patches above the eyebrows, in the nasolabial folds, and along the hairline.
• In severe cases, the lesions are prominent and resemble psoriasis.
• Red, scaly patches resembling dandruff are found on the scalp.
• Rashes are often found in areas with many sebaceous glands, such as in the ear canals, behind the ears, in the navel, and in the pubic area.
• Thick dandruff forms on the scalp, hair, eyebrows, mustache, or beard.

Who is at risk of developing seborrheic dermatitis?

• Newborns up to 3 months of age often present with thick scales on the scalp (cradle cap) or in the diaper area. This usually resolves on its own as the child grows.
• Adults aged 30-60 years are more affected in men than women.
• People with accumulated stress and insufficient sleep, leading to an impaired immune system.
• People with compromised immune systems, such as those infected with HIV.
• Patients with neurological and psychiatric disorders, such as Parkinson's disease, depression, or those recovering from heart failure.

Why do seborrheic dermatitis symptoms often worsen in cold weather?

While seborrheic dermatitis can occur and flare up in both summer and winter, many people notice that symptoms worsen during cold, dry weather or when changing seasons. The main reasons include:

• Skin loses moisture from cold, low humidity. Cold weather dries out the skin, weakening the skin barrier, causing peeling, redness, irritation, and increased sensitivity to oil and Malassezia bacteria, thus triggering seborrheic dermatitis.
• Habits like spending time in air-conditioned rooms and taking very hot showers. Dry air and hot water strip away natural oils, disrupting the skin barrier's balance. The body compensates with excessive oil production, resulting in dehydrated yet oily skin, which promotes fungal growth.
• Rapid temperature and seasonal changes. Sudden changes in temperature disrupt blood vessels and the skin barrier, leading to irritation and inflammation.
• Reduced sun exposure. Less sunlight in winter or staying indoors means less sunlight to inhibit Malassezia bacteria, allowing them to multiply and cause flare-ups.
• Stress and risky behaviors during cold weather. Cold weather is often associated with stress, lack of sleep, and increased alcohol consumption. This is a factor that accelerates the flare-up of seborrheic dermatitis.

Seborrheic Dermatitis vs. Psoriasis vs. Dry Skin: What are the Differences?

Skin with redness, scaling, or itching may look similar in the early stages, but seborrheic dermatitis, psoriasis, and dry skin have distinct causes, locations, and lesion characteristics that can be observed as follows:

Seborrheic Dermatitis

• The rash is red with yellowish-white scales or flakes that are shiny, similar to dandruff.
• Location: Areas with a high concentration of sebaceous glands, such as the scalp, hairline, eyebrows, nasolabial folds, behind the ears, and chest.
• Characteristic features: Often relapsing and worsening with stress, lack of sleep, or changes in weather.

Psoriasis

• The rash is thick, red patches with well-defined borders, covered with thicker, silvery scales than in seborrheic dermatitis.
• Location: Areas of frequent friction, such as elbows, knees, shins, back, as well as the scalp and nails.
• Characteristic features: Caused by an autoimmune disorder that causes skin cells to divide abnormally rapidly. If you pick or scratch the scabs, they often bleed slightly.

Dry skin.

• Rash characteristics: Rough, flaky skin with small, white, non-shiny scales, and no thick, inflamed patches.
• Location: Can occur anywhere on the body, especially the shins, arms, and hands.
• Typical characteristics: Often triggered by environmental factors such as dry and cold air, very hot showers, or the use of harsh soaps. Symptoms improve and disappear with consistent application of moisturizer.

How to Treat Seborrheic Dermatitis

Seborrheic dermatitis cannot be cured completely, but symptoms can be controlled and flare-ups prevented. Treatment methods usually depend on the location and severity of the disease and include:

• Topical steroids: Applied to inflamed and reddened areas to quickly reduce symptoms. Mild to moderate-strength steroids should be used for short periods as prescribed by a doctor to prevent side effects such as skin thinning.
• Antifungal creams: Help reduce the amount of Malassezia fungus, which is the main contributing factor. Examples include ketoconazole.
• Antifungal shampoos: For those with scalp symptoms, shampoos containing ketoconazole, selenium sulfide, or zinc pyrithione should be used. Leave on for 3-5 minutes before rinsing.
• Non-steroidal anti-inflammatory drugs (NSAIDs): Such as tacrolimus, help reduce inflammation and are generally safe for continuous use.
• Use a moisturizer: Apply a fragrance-free and alcohol-free moisturizing cream to hydrate and strengthen the skin barrier.

How to prevent seborrheic dermatitis:

• Manage stress and get enough rest. These are crucial factors in maintaining a balanced immune system and preventing flare-ups.
• Cleanse gently: Choose gentle facial and body washes.
• Avoid using very hot water to wash your face or body, as it strips away natural oils, leaving your skin feeling dry and tight.
• Avoid scratching: Scratching rashes or dandruff will worsen skin inflammation and increase the risk of secondary bacterial infections.
• Choose appropriate skincare: Avoid products containing alcohol, fruit acids (AHA/BHA), or harsh scrubs during flare-ups.

Foods to Help Reduce Seborrheic Dermatitis Symptoms

Choosing foods that help reduce inflammation and balance the immune system can help control seborrheic dermatitis symptoms. Here's how:

• Foods rich in omega-3s, such as salmon, tuna, sardines, chia seeds, and walnuts, help reduce inflammation in the body.
• Foods high in antioxidants, including leafy green vegetables, berries, tomatoes, and carrots, help repair skin cells and boost immunity.
• Foods containing probiotics, such as plain yogurt, kimchi, fermented milk, and kombucha, help balance gut microbiota, which is linked to a healthy skin immune system.
• Foods to avoid: Reduce your intake of white sugar, processed foods, fried foods, foods high in saturated fat, and alcoholic beverages, as these can trigger inflammation.

Treating Seborrheic Dermatitis at Vibhavadi Hospital

If you experience persistent itching, redness, or flaking, it may be a sign of seborrheic dermatitis. Consult us for advice on your symptoms and treatment options. If you suspect you have seborrheic dermatitis, you can take care of yourself at the Dermatology Clinic, Vibhavadi Hospital. Here, we provide targeted treatment by expert dermatologists and utilize state-of-the-art medical equipment. This allows us to plan treatment, diagnose, and recommend effective self-care strategies to alleviate symptoms efficiently.

Summary

Seborrheic dermatitis, or sebaceous gland allergy, is a chronic inflammatory skin disease that typically occurs in areas with high oil production and sebaceous glands, such as the scalp and face. Symptoms include red, itchy, flaky, shiny rashes. The main causes are an overgrowth of the Malassezia fungus, stress, lack of sleep, and cold, dry winter weather that dehydrates the skin while keeping it oily, triggering flare-ups. Treatment focuses on controlling symptoms with antifungal creams, medicated shampoos, anti-inflammatory medications, and moisturizers to strengthen the skin barrier. Prevention involves getting enough rest, avoiding very hot drinks, and consuming anti-inflammatory foods rich in omega-3 and probiotics.

Anyone who suspects they have seborrheic dermatitis or needs advice on self-care for seborrheic dermatitis can consult Vibhavadi Hospital. Here, we provide guidance on treatment, diagnosis, and self-care from specialist dermatologists to help improve seborrheic dermatitis and allow you to live a happy life.

Be mindful of temperature changes: Apply moisturizer more frequently in cold or dry weather and avoid prolonged sun exposure.