Seborrhoeic Dermatitis: Managing Flaky, Red, Greasy Patches

Seborrhoeic dermatitis causes flaky, red, greasy patches on the scalp, face and chest. Learn the triggers, how to read skincare labels, a calm daily routine and when to see a GP.

What seborrhoeic dermatitis is

Seborrhoeic dermatitis is a common, long-term skin condition that causes flaky, sometimes red and slightly greasy patches. It favours areas where the skin has more oil glands: the scalp, where it overlaps with dandruff, the sides of the nose, the eyebrows, the creases beside the nose, behind and inside the ears, and the middle of the chest. In babies it appears as “cradle cap”, though that is a separate, self-limiting version.

It is not an allergy and it is not caused by being unclean. It is linked to a yeast called Malassezia that lives naturally on everyone’s skin, along with how your own skin and immune system respond to it and to the oils on the surface. Because a normal skin resident is involved rather than a one-off trigger, seborrhoeic dermatitis tends to come and go in flares over months and years rather than clearing once and never returning. That pattern is normal and does not mean you are doing anything wrong.

What it looks and feels like

The flaking can be fine and white or larger and yellowish, sometimes with a faintly greasy feel rather than the dry, tight sensation of eczema. The skin underneath may look pink or red, and mild itching or a slight burning feeling is common. On the scalp it can range from ordinary dandruff to redder, scalier patches. Around the nose and brows it often shows as reddish, flaky creases. On darker skin tones the redness can look more grey, brown or violet, and you may notice lighter or darker marks where a patch has settled. Flares often ease and then return, especially with cold weather, tiredness or stress.

What tends to trigger or worsen it

Because Malassezia yeast thrives on skin oils, the pattern of flares is tied to your skin’s environment as much as to specific products. Cold, dry seasons, stress, poor sleep and being run down are all common triggers. Skincare choices matter too, and a few ingredient groups tend to aggravate greasy-area patches:

• Fragrance and essential oils. Added perfume, listed as “parfum” or “fragrance”, and essential oils such as tea tree, peppermint or lavender can irritate already inflamed skin. Some essential oils are also rich in the very lipids the yeast feeds on.
• Heavy, occlusive oils and butters. Rich balms and greasy creams can sit on the surface and feed the yeast, so “more moisture” is not always the answer here.
• Sodium lauryl sulfate (SLS) and other harsh cleansing agents that strip and irritate the skin, prompting a rebound.
• Over-washing and scrubbing, which damages the barrier and can make redness and flaking worse rather than better.

Reading labels helps you spot these. The key point is that seborrhoeic dermatitis is rarely fixed by “gentle skincare” alone, because the yeast element usually needs addressing directly with an antifungal step.

How to read labels and choose products

The ingredient list, printed under “Ingredients” using INCI names (the standard international naming for cosmetics), is where you find your answers. A few habits make it manageable:

• Scan for fragrance. Look for “parfum”, “fragrance”, and named essential oils. These sit anywhere in the list.
• Understand fragrance-free versus unscented. “Fragrance-free” should mean no perfume has been added. “Unscented” can mean a masking fragrance has been used to hide a smell, which still counts as fragrance. For reactive skin, fragrance-free is the safer label.
• Favour light textures. For greasy-area patches, a lightweight, non-greasy moisturiser usually suits better than a rich balm.
• Look for the useful actives. Antifungal or anti-yeast ingredients such as ketoconazole, ciclopirox, zinc pyrithione and selenium sulfide are the ones that tend to help, most often in medicated shampoos you can also use briefly on affected facial areas as directed. A pharmacist can point you to suitable over-the-counter options.
• Patch test. Before using a new product widely, dab a small amount on the inner forearm once daily for a few days and watch for a reaction.

A calm daily approach

Aim for a simple, consistent routine rather than a shelf of products. Cleanse gently with a mild, fragrance-free wash and lukewarm, not hot, water. Use a medicated antifungal shampoo on the scalp as directed, and, where a pharmacist advises, briefly on flaky facial areas, rinsing well. Follow with a light, fragrance-free moisturiser to support the skin barrier. Pat dry rather than rubbing, and resist the urge to pick or scrub the flakes, which prolongs the redness. Managing flares early, at the first sign of return, tends to keep them milder than waiting until a patch is well established. Small, steady habits beat occasional intense treatment.

When to see a GP or dermatologist

Seborrhoeic dermatitis is manageable, but some situations deserve professional help rather than more trial and error. See a GP or pharmacist if over-the-counter measures are not controlling it, if patches are widespread, very red or weeping, or if the skin looks infected, for example crusting, swelling, warmth or spreading redness. Get advice promptly if it affects the eyelids, causing sore, red rims, or if it is affecting your sleep or confidence. A GP or dermatologist can prescribe stronger antifungal or anti-inflammatory treatment and confirm the diagnosis, since a few other conditions can look similar. This guide is educational and is not a substitute for personal medical advice.

Myth-buster

A persistent myth is that flaky, greasy patches mean your skin is dirty and needs harder scrubbing or stronger soap. The opposite is usually true. Aggressive washing strips the barrier and provokes more redness, while the yeast at the root of the problem is unaffected by ordinary cleaning. Gentle care plus a targeted antifungal step is what actually settles it.

Check products against your list

To check a product, a free analyser like Skincarisma lets you paste a product at your desk and see the ingredients you are avoiding flagged in the ingredient list, and SkinSAFE lets you filter a product catalogue to screen out the ingredients you are avoiding and other allergens. These rate a product on general criteria rather than against your own list.

Once you know what you are screening for, a personal-list app like ClearaScan lets you save the ingredients you react to once and scan any product to flag only your triggers. It also keeps a Reaction Journal for flare-ups, a shared Care Circle so family or carers can scan for you, and a Trusted Products list for items you have cleared, and it is currently in early access. (Disclosure: our editor co-founded ClearaScan, and we are not paid to mention the others.)

Written and reviewed by the Sensitive Skin Lab editorial team.