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Facts about the skin from DermNet New Zealand Trust. Topic index: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z


Seborrhoeic dermatitis

What is seborrhoeic dermatitis

Seborrhoeic dermatitis is a common, harmless, scaling rash affecting the face, scalp and other areas. The American spelling is ‘seborrheic’, and ‘dermatitis’ is sometimes called ‘eczema’.

Dandruff (also called ‘pityriasis capitis’) is an uninflamed form of seborrhoeic dermatitis. Dandruff presents as scaly patches scattered within hair-bearing areas of the scalp.

Seborrhoeic dermatitis may appear at any age after puberty. It fluctuates in severity and may persist for years. It may predispose to psoriasis. However, the plaques of psoriasis are more persistent, thicker, and a deeper red colour, with large flakes of white scale. Psoriasis is very likely to affect elbows and knees as well as the scalp. However, sometimes it is difficult to tell psoriasis from seborrhoeic dermatitis on the face, scalp and chest and your doctor may diagnose an overlap condition, known as ‘sebopsoriasis’.

Despite the name, seborrhoeic dermatitis is nothing to do with seborrhoea (oily skin), although it was originally thought only to affect oily areas of skin.

What does seborrhoeic dermatitis look like?

Within the scalp, seborrhoeic dermatitis causes ill-defined dry pink or skin coloured patches with yellowish or white bran-like scale. It may spread to affect the entire scalp.

Seborrhoeic dermatitis is common within the eyebrows, on the edges of the eyelids (blepharitis), inside and behind the ears and in the creases beside the nose. It can result in pale pink round or ring shaped patches on the hairline.

Sometimes it affects the skin-folds of the armpits and groin, the middle of the chest or upper back. It causes salmon-pink flat patches with a loose bran-like scale, sometimes in a ring shape (annular). It may or may not be itchy and can be quite variable from day to day. An extensive form of seborrhoeic dermatitis is sometimes called pityriasiform seborrhoeide.

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Seborrhoeic dermatitis

What is the cause of seborrhoeic dermatitis?

Seborrhoeic dermatitis is believed to be an inflammatory reaction related to a proliferation of a normal skin inhabitant, a yeast called Malassezia (formerly known as Pityrosporum ovale). The main species found in the scalp is M. globosa. It produces toxic substances that irritate the skin. Patients with seborrhoeic dermatitis appear to have a reduced resistance to the yeast.

Seborrhoeic dermatitis is not contagious or related to diet, but it may be aggravated by illness, psychological stress, fatigue, change of season and reduced general health. Those with immunodeficiency (especially infection with HIV), heavy alcohol intake, and with neurological disorders such as Parkinson's disease and stroke are particularly prone to it.

Infantile seborrhoeic dermatitis

It is uncertain whether infantile seborrhoeic dermatitis is the same condition. This arises in newborn babies up to the age of six months. It usually presents as cradle cap, but infantile seborrhoeic dermatitis may also affect skin creases such as armpits and groin (when it presents as a type of napkin dermatitis). Non-itchy salmon pink flaky patches may appear on the face, trunk and limbs in severe cases.

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Infantile seborrhoeic dermatitis

What is the treatment for seborrhoeic dermatitis?

Seborrhoeic dermatitis in adults may be very persistent. However, it can generally be kept under control with regular use of antifungal agents and intermittent applications of topical steroids.

Infantile seborrhoeic dermatitis usually clears up completely before the baby is six months old and rarely persists after one year. If treatment is required, mild emollients, hydrocortisone cream and / or topical ketoconazole are useful.

Scalp

Face, ears, chest & back

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If you have any concerns with your skin or its treatment, see a dermatologist for advice.