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Symptoms and treatment of seborrheic dermatitis

What is seborrheic dermatitis?

Seborrheic dermatitis is an eczema that forms on areas where sebum is actively secreted, such as the head, hairline, and face.
The affected area is reddish with a slightly yellowish, moist dandruff or dry, scaly dandruff.
In severe cases, dandruff may harden and become like a scab.
There are "infant type" seen from newborn to infancy and "adult type" seen in adults after puberty.



Malassezia, a type of fungus that is resident on the skin, is said to be involved in the development of seborrheic dermatitis.
The growth of Malassezia, which is nourished by sebum, on the skin itself is thought to cause skin inflammation.
Malassezia breaks down the component "triglycedo" contained in sebum into free fatty acids, and the irritation to the skin caused by the free fatty acids is also thought to be the cause of dermatitis.
The underlying cause of the abnormal growth of Malassezia is still unknown, but changes in sebum components and secretions due to the environment, metabolic disorders such as vitamins B2 and B6, lack of bathing and face washing, stress, and lack of sleep. , It is said that factors such as hormonal disturbance are related.
Adult-type seborrheic dermatitis is common in post-pubertal men, which is thought to be related to the effects of the male hormone (androgen), which stimulates the secretion of sebum.


It is often found on the scalp and hairline, eyebrows, nose, behind the ears, armpits, chest, crotch, and back of the knees. These sites are areas where sebaceous glands that secrete sebum have developed and are called seborrheic sites.

It is painless and, in most cases, itchy, but it can also be mild.
The affected skin turns red, and yellowish, greasy, moist dandruff or dry, scaly dandruff appears tattered.
Severe dandruff, peeled skin, and bleachate may solidify and cover the affected area with something like a scab.
Most infantile seborrheic dermatitis is transient and, with proper skin care, usually heals spontaneously around 8-12 months of age.
Adult seborrheic dermatitis, which occurs after puberty, once it develops, it gets better and worse, and often has a chronic course. When the symptoms get worse, they rarely heal spontaneously and require appropriate treatment in the hospital.



Symptoms such as itching and dandruff on the scalp can also be caused by rashes (contact dermatitis) caused by unwashed shampoo and conditioner, but if the symptoms persist, they are seborrheic dermatitis. There is a possibility. If there is no inflammation such as redness of the skin and only dry dandruff appears, it may be called pityriasis or dry seborrhea, so-called "dandruff". There are several other diseases with similar skin symptoms, such as atopic dermatitis and candidiasis caused by another type of mold. It is difficult to distinguish between them, and specialized treatment is required according to the illness, so if you have any symptom you can think of, see a dermatologist. However, eczema can occur due to mechanical stimuli such as raising nails on the head, scrubbing, and plucking dandruff, so if you change such lifestyle, eczema on the head and face other than seborrheic dermatitis. May get better.
Seborrheic dermatitis is a condition in which the affected area is inflamed. In dermatology, topical steroids are generally used to control inflammation. Depending on the symptoms, an antifungal external preparation that suppresses the growth of mold may be used in combination.

Things to watch out for in your daily life

Clean the skin

First of all, it is important to wash your face and hair properly to keep the areas where sebum tends to accumulate clean. Take proper measures to prevent sebum stains from accumulating in your daily life.
If the condition is not good even after washing your face and hair, you may try changing the shampoo or soap. Avoid using oily hair styling products, shampoos, and rinses as much as possible, and switching to shampoos, rinses, and soaps that contain antifungal agents may help improve the scalp environment.

Review your lifestyle

Daily lack of sleep and excessive stress are exacerbating factors for skin symptoms. If you feel that your skin is not feeling well, first try to get enough sleep. It is also important to lead a stress-free life by taking time to change your mood.
When bathing or washing your hair, do not put your nails on your scalp or scrub your skin, and wash gently with foam.
Drinking and eating too much and an unbalanced diet also exacerbate skin symptoms. Try to have a well-balanced and regular diet.