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Seborrheic dermatitis: the adult face rash that isn’t atopic eczema

If you're an adult with flaking and redness around your nose, eyebrows, hairline or ears, the odds are good that this isn't atopic eczema at all. Seborrheic dermatitis is probably the most common form of facial eczema in adults — and because it's driven by something different, it's treated differently. Knowing which one you have changes what actually works.

A plain-language explainer · Not medical advice — a doctor can tell these apart and guide treatment

Where it turns up

Seborrheic dermatitis favours the parts of the skin with the most oil glands — which is exactly why its distribution is such a useful clue. It commonly affects the scalp, eyebrows, forehead, the creases beside the nose, the ears, the chest, and skin folds. On the scalp it ranges from ordinary-looking dandruff all the way to inflamed, weeping scale. On the face it shows as redness or discolouration around the nose, and it can involve the eyelid margins.

If you have been treating "facial eczema" for months with something that keeps not quite working, the pattern of where it sits is worth taking to a doctor.

What's driving it

Adult seborrheic dermatitis is an inflammatory reaction to an overgrowth of Malassezia — yeasts that live on everybody's skin, harmlessly, most of the time. Why some people react to them and others don't isn't known. It affects roughly 4% of adults, more men than women, and tends to peak around age 30 in men and 40 in women. Susceptibility is higher in people with immunodeficiency, high alcohol intake, or neurological conditions such as Parkinson's disease or after a stroke.

The practical difference from atopic eczema. Atopic eczema is a barrier-and-immune problem, and the mainstays are emollients and anti-inflammatory treatment. Seborrheic dermatitis is a reaction to a yeast, so anti-yeast treatment is central — shampoos, creams and ointments, sometimes alongside a mild topical steroid for the inflammation. Treating one as though it were the other is the usual reason months go by without progress.

What treatment looks like

Because the yeast sensitivity persists, this is a condition that is managed rather than finished — long-term, intermittent treatment is what keeps it quiet, and flares that return after a good stretch are the expected course, not a sign that you did something wrong. Which anti-yeast preparation, how often, and whether anything anti-inflammatory belongs alongside it are your doctor's decisions.

If it involves your eyelid margins, say so specifically — that area gets treated with more care than the rest of the face. See eczema on the face and eyelids and eczema and eye health.

Can you have both?

Yes. Having atopic eczema elsewhere does not protect you from this, and the two can sit on the same face. That's another reason the answer to "what is this, exactly?" belongs to someone who can look at it rather than to a search box — including this one. Our guide on is it eczema — or something else? covers the wider field of things that get mistaken for eczema.

A note on the word "dandruff". Being told your face problem is "just dandruff spreading" can feel dismissive when it's sore, visible and has been going on for years. Mild scalp seborrheic dermatitis and dandruff really do sit on the same spectrum — but that doesn't make an inflamed, uncomfortable face a small thing, and it doesn't mean you should be managing it alone with a supermarket shampoo.

Find out whether it actually settles

Seborrheic dermatitis runs in cycles, which makes it very hard to judge by memory whether the current approach is working. Ollowen's check-in and photo timeline show the shape of the last three months instead of the last three days — the difference between a guess and an answer at your next appointment.

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