|Synonyms||Seborrhoea, sebopsoriasis, seborrhoeic eczema, pityriasis capitis|
|An example of seborrhoeic dermatitis between the nose and mouth|
|Symptoms||Itchy, flaking, greasy, red, and inflamed skin|
|Causes||Genetic and environmental factors|
|Risk factors||Stress, winter, poor immune function, Parkinson disease, epilepsy, Down syndrome|
|Diagnostic method||Based on symptoms|
|Differential diagnosis||Psoriasis, atopic dermatitis, tinea capitis, rosacea, systemic lupus erythematosus|
|Medication||Antifungal cream, anti-inflammatory agents, coal tar, phototherapy|
|Frequency||~2% (adults), ~40% (babies)|
Seborrhoeic dermatitis, also known as seborrhoea, is a long-term skin disorder. Symptoms include red, scaly, greasy, itchy, and inflamed skin. Areas of the skin rich in oil-producing glands are often affected including the scalp, face, and chest. It can result in social or self-esteem problems. In babies, when the scalp is primarily involved, it is called cradle cap. Dandruff is a milder form of the condition, without associated inflammation.
The cause is unclear but believed to involve a number of genetic and environmental factors. Risk factors include poor immune function, Parkinson disease, epilepsy, and Down syndrome. The condition may worsen with stress or during the winter. It is not a result of poor hygiene. Diagnosis is typically based on the symptoms.
The typical treatment is antifungal cream and anti-inflammatory agents. Specifically ketoconazole or ciclopirox are effective. It is unclear if other antifungals, such as miconazole, are equally effective as they have been poorly studied. Other options may include coal tar and phototherapy.
The condition is most common in those around the age of 50, during puberty, and among those less than three months old. In adults about 2% of people are affected. Males are more often affected than females. Up to 40% of babies may be affected to some degree.
Signs and symptoms
Seborrhoeic dermatitis' symptoms appear gradually, and usually the first signs are flaky skin and scalp. Symptoms occur most commonly anywhere on the skin of the scalp, behind the ears, on the face, and in areas where the skin folds. Flakes may be yellow, white or grayish. Redness and flaking may also occur on the skin near the eyelashes, on the forehead, around the sides of the nose, on the chest, and on the upper back.
In more severe cases, yellowish to reddish scaly pimples appear along the hairline, behind the ears, in the ear canal, on the eyebrows, on the bridge of the nose, around the nose, on the chest, and on the upper back.
Commonly, patients experience mild redness, scaly skin lesions and in some cases hair loss. Other symptoms include patchy scaling or thick crusts on the scalp, red, greasy skin covered with flaky white or yellow scales, itching, soreness and yellow or white scales that may attach to the hair shaft.
Seborrhoeic dermatitis can occur in infants younger than three months and it causes a thick, oily, yellowish crust around the hairline and on the scalp. Itching is not common among infants. Frequently, a stubborn diaper rash accompanies the scalp rash. Usually, when it occurs in infants the condition resolves itself within days and with no treatment.
In adults, symptoms of seborrhoeic dermatitis may last from a few weeks, to years. Many patients experience alternating periods of inflammation. The condition is referred to a specialist when self-care has proven unsuccessful.
The main species of yeast found on the scalp of those with the condition is Malassezia globosa, others being Malassezia furfur (formerly known as Pityrosporum ovale) and Malassezia restricta. It has been suggested that the yeast produces toxic substances that irritate and inflame the skin. Patients with seborrhoeic dermatitis appear to have a reduced resistance to the yeast. However, the colonization rate of affected skin may be lower than that of unaffected skin.
Only saturated fatty acids (FAs) have been shown to support Malassezia growth. It has also been shown that while number density of M. globosa and M. restricta do not directly correlate to dandruff presence or severity, removal correlates directly with amelioration of flaking. Furthermore, in dandruff-susceptible individuals pure oleic acid, an unsaturated FA and Malassezia metabolite, induces flaking in the absence of Malassezia by direct effects on the host skin barrier. These findings support the following hypothesis:
Malassezia hydrolyze human sebum, releasing a mixture of saturated and unsaturated fatty acids. They take up the required saturated FAs, leaving behind unsaturated FAs. The unsaturated FAs penetrate the stratum corneum. Because of their non-uniform structure, they breach the skin's barrier function. This barrier breach induces an irritation response, leading to dandruff and seborrhoeic dermatitis.[unreliable source?]
Genetic, environmental, hormonal, and immune-system factors can impact seborrhoeic dermatitis outbreaks. Seborrhoeic dermatitis may be aggravated by illness, psychological stress, fatigue, sleep deprivation, change of season and reduced general health. In children and babies, excessive vitamin A intake  or issues with delta-6 desaturase enzymes  have been correlated with increased risk. Seborrhoeic dermatitis-like eruptions are also associated with vitamin B6 deficiency. Those with immunodeficiency (especially infection with HIV) and with neurological disorders such as Parkinson's disease (for which the condition is an autonomic sign) and stroke are particularly prone to it.
A number of medications are able to control seborrhoeic dermatitis including: certain antifungals, topical corticosteroids, and keratolytics such as topical urea, as well as antiandrogens and antihistamines.
Daily use of an over-the-counter or prescription anti-fungal shampoo may help those with recurrent episodes. The topical antifungal medications ketoconazole and ciclopirox have the best evidence. It is unclear if other antifungals are equally effective as this has not been studied. Another potential option is natural and artificial UV radiation since it can curb the growth of Malassezia yeast 
Seborrhoea is recognized as an androgen-sensitive condition – that is, it is caused or aggravated by androgen sex hormones such as testosterone and dihydrotestosterone – and is a common symptom of hyperandrogenism (e.g., that seen in polycystic ovary syndrome). In addition, seborrhoea, as well as acne, are commonly associated with puberty due to the steep increase of androgen levels at that time.
In accordance with the involvement of androgens in seborrhoea, antiandrogens, such as cyproterone acetate, spironolactone, and flutamide, are highly effective in alleviating the condition. As such, they are used in the treatment of seborrhoea, particularly severe cases. While beneficial in seborrhoea, effectiveness may vary with different antiandrogens; for instance, spironolactone (which is regarded as a relatively weak antiandrogen) has been found to produce a 50% improvement after three months of treatment, whereas flutamide has been found to result in an 80% improvement within three months. Cyproterone acetate is similarly more potent and effective than spironolactone, and results in considerable improvement or disappearance of acne and seborrhoea in 90% of patients within three months.
Systemic antiandrogen therapy should only be used to treat seborrhoea in women, and never in men, as these drugs can result in feminization (e.g., gynecomastia), sexual dysfunction, and infertility in males. In addition, antiandrogens theoretically have the potential to feminize male fetuses in pregnant women, and for this reason, should always be combined with effective contraception in sexually active women who can or may become pregnant.
Topical steroids have been shown to be effective in short-term treatment of serborrhoeic dermatitis, and is as effective or more effective than azole treatment. There is also evidence for the effectiveness of calcineurin inhibitors and lithium salt treatment. 
- Coal tar can be effective, but, although no significant increased risk of cancer in human treatment with coal tar shampoos has been found, caution is advised since coal tar is carcinogenic in animals, and heavy human occupational exposures do increase cancer risks.
- Pimecrolimus topical cream immunosuppressant
- Prednisone — an oral immunosuppressive treatment that has been used in short courses as a last resort due to its potential side effects.
- Isotretinoin — As a last resort in refractory disease, sebosuppressive agent isotretinoin may be used to reduce sebaceous gland activity. However, isotretinoin has potentially serious side effects and few patients with seborrhoea are appropriate candidates for therapy.
Seborrhoea affects 1 to 5% of the general population. It is slightly more common in men, but affected women tend to have more severe symptoms. The condition usually recurs throughout a person's lifetime. Seborrhoea can occur in any age group but usually starts at puberty and peaks in incidence at around 40 years of age. It can reportedly affect as many as 31% of older people. Severity is worse in dry climates.
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