Seborrheic dermatitis shows up as patches of greasy or flaky skin covered in white-to-yellow scales, usually on the scalp, face, and chest. It affects roughly 4 to 6% of adults worldwide and tends to settle in areas where your skin produces the most oil. The appearance varies depending on your skin tone and where on the body it develops, so recognizing it isn’t always straightforward.
The Classic Look: Scales, Redness, and Oily Patches
The hallmark of seborrheic dermatitis is scaling that looks either powdery-dry or waxy and greasy. These scales sit on top of inflamed skin and range from white to yellowish in color. On lighter skin, the patches beneath the scales appear pink or red. On darker skin tones, the inflammation may be harder to spot, and the patches often look lighter or darker than the surrounding skin rather than obviously red.
The scales tend to cling to the skin and can flake off in visible pieces, which is why seborrheic dermatitis on the scalp is essentially what people call dandruff. In more severe cases, you’ll see raised bumps that are small and yellowish or dark in color. The skin underneath often feels oily to the touch even when the flakes themselves look dry. A mild burning or itching sensation usually accompanies the visual changes.
Where It Typically Appears
Seborrheic dermatitis follows the oil glands, so it clusters in predictable spots. The scalp is the most common location, but the condition frequently shows up on the face as well, particularly in the creases alongside the nose, on and between the eyebrows, and along the hairline. The skin behind your ears is another classic spot.
Beyond the face and scalp, patches can develop on the center of the chest, the upper back between the shoulder blades, the armpits, the groin, and beneath the breasts. These areas share a combination of warmth, moisture, and high oil production that the yeast involved in seborrheic dermatitis thrives on. On the body, the patches tend to be more clearly defined and may follow a ring-like or petal-shaped pattern.
How It Looks on Darker Skin
Seborrheic dermatitis can look quite different on brown or Black skin, and this sometimes leads to missed or delayed recognition. Instead of obvious redness, darker-skinned individuals often develop scaly patches that are lighter than their normal skin tone. These hypopigmented (lightened) areas can be the most visible feature, sometimes more noticeable than the scaling itself.
A distinct variant called petaloid seborrheic dermatitis is more commonly seen in people with darker skin. It produces curved, petal-shaped or arc-like patches, often on the chest or face, that look different from the typical irregular patches seen on lighter skin. Darkening of the skin (hyperpigmentation) can also occur, especially after the active flare settles, leaving behind discoloration that takes weeks or months to fade on its own.
Cradle Cap in Babies
In infants, seborrheic dermatitis goes by the name “cradle cap” and looks like thick, crusty, yellowish patches stuck to the scalp. The crusts can appear greasy or waxy and sometimes cover large areas of the top of the head. On white skin, the patches sit on a pink or mildly inflamed base. On Black or brown skin, the crusts appear similar but the underlying skin may show lighter patches rather than redness.
Cradle cap isn’t limited to the scalp. Similar greasy scales can show up on a baby’s eyelids, around the nose, behind the ears, and in the diaper area. It looks alarming to many parents, but it rarely bothers the baby and typically clears within the first several months of life. About 3.7% of children are affected at any given time, compared to roughly 5.6% of adults.
When It Affects the Eyelids
Seborrheic dermatitis on the eyelids, sometimes called seborrheic blepharitis, has its own distinct appearance. The eyelid margins look greasy, and small scales or crusts cling to the base of the eyelashes. The lids may appear swollen or slightly discolored. Many people with this form notice their eyelids feel stuck together in the morning, or they wake up with dried flakes around their eyes and a gritty, sandy feeling. The skin around the eyes can also become flaky and irritated, sometimes extending to the eyebrows.
How to Tell It Apart From Psoriasis
Scalp psoriasis and seborrheic dermatitis look similar enough to confuse even experienced clinicians, and some people have an overlap of both (sometimes informally called “sebopsoriasis”). A few visual clues help distinguish them. Psoriasis scales tend to be thicker, drier, and more silvery-white, while seborrheic dermatitis scales are thinner, greasier, and more yellowish. Psoriasis patches also tend to have sharper, more well-defined borders.
Location matters too. Psoriasis on the scalp often extends past the hairline onto the forehead or behind the ears, forming a visible band of thick scale along the hair’s edge. Seborrheic dermatitis usually stays within the hairline or settles into facial creases and oily zones. If you see thick, dry, silvery plaques that cross the hairline, psoriasis is the more likely explanation.
How to Tell It Apart From Rosacea
On the face, seborrheic dermatitis can overlap with rosacea since both cause redness in the central face. The key difference is texture. Seborrheic dermatitis almost always involves visible scaling or flaking, and it tends to concentrate in the folds alongside the nose, on the eyebrows, and near the hairline. Rosacea produces flushing, visible tiny blood vessels, and sometimes small pus-filled bumps, but it doesn’t cause flaky scales. Rosacea also favors the cheeks, nose tip, and chin rather than the eyebrows and scalp.
Some people have both conditions at once, which makes things harder to sort out. If your facial redness comes with greasy flaking in the eyebrows or nasolabial folds, seborrheic dermatitis is likely part of the picture.
What a Flare Looks Like Over Time
Seborrheic dermatitis is chronic and cyclical. During a flare, the scaling and redness intensify, patches may spread to new areas, and itching or burning increases. Between flares, the skin can look nearly normal, or you might have mild, persistent dandruff as a baseline. Flares tend to worsen in cold, dry weather, during periods of stress, or when you’re sleep-deprived or unwell.
On the scalp, a mild flare looks like increased white flaking on your shoulders and in your hair. A more severe flare produces thick, yellowish, adherent crusts that may cover much of the scalp. On the face, flares can make the skin around the nose and eyebrows visibly red and scaly in a way that’s hard to cover with moisturizer or makeup. The condition doesn’t cause scarring, but on darker skin the post-inflammatory color changes can linger for some time after the flare itself resolves.