Cradle Cap, Eczema, Drool or Friction? How to Tell Baby Rashes Apart

Seven things that look almost identical on a small face, and how to tell which one you are actually looking at.

It is nearly always the same scene. Half past two in the morning, one lamp on, a phone held at an awkward angle over the change table while you compare a patch of red skin against a search result that could be anything. Every photograph online looks like every other photograph. Half the advice contradicts the other half. And the baby, sublimely unbothered, has gone back to sleep.

Here is the thing worth knowing before you scroll any further: the answer is usually in the where, not the what. Colour tells you very little. Position tells you almost everything.

Why baby skin reacts to almost everything

Newborn skin is around a third thinner than yours, and the barrier that holds moisture in and keeps irritants out spends the whole first year still under construction. It loses water faster. It absorbs more of whatever touches it. And it registers heat, friction and saliva far more visibly than adult skin ever would.

Which is why half a dozen unrelated causes all arrive looking like the same thing: red, blotchy, sometimes bumpy. The questions that actually separate them are where it sits, what the surface feels like under a fingertip, and what makes it better or worse.

How do I tell the common baby rashes apart?

Condition	Where it appears	What it looks like	Itchy?
Cradle cap	Scalp, eyebrows, behind ears	Greasy yellow or brown scale, crusty patches	Rarely
Eczema	Cheeks, skin creases, behind knees and elbows	Dry, rough, red patches; may weep or thicken	Yes — often intensely
Drool rash	Mouth, chin, neck folds, upper chest	Flat red patches, sometimes slightly raised	Mildly
Friction rash	One cheek or side of face; back of head	Diffuse redness on the contact side only	Not usually
Heat rash	Neck, back, chest, nappy area, under clothing	Tiny pinprick bumps or clear blisters	Prickly
Baby acne	Cheeks, nose, forehead	Small red or white pimples	No
Milia	Nose, chin, cheeks	Tiny firm white spots, no redness	No

Cradle cap: greasy scale on the scalp

Cradle cap — infantile seborrhoeic dermatitis, if you want the formal name — usually appears in the first two to three months as yellowish, greasy scale across the scalp, sometimes reaching the eyebrows or tucking in behind the ears. It looks considerably worse than it is. Babies are almost never bothered by it, and if yours is scratching at their scalp, you are probably looking at eczema instead.

It has nothing to do with hygiene and it is not contagious. Most of it is gone somewhere between six and twelve months.

What helps: Soften the scale with a little baby-safe oil before a bath, leave it a few minutes, then loosen gently with a soft brush and wash out. Do not pick or scrape it — breaking the skin underneath is how a harmless thing becomes an infected one.

See your GP if: it spreads well beyond the scalp, weeps, smells, or the skin beneath looks angry.

Eczema: dry, itchy, and it keeps coming back

Atopic dermatitis affects roughly one in five Australian children and usually shows up after three months. Three things mark it out: dryness rather than greasiness, real itch, and a rhythm of flaring and settling instead of steady improvement.

In young babies it often begins on the cheeks, which is exactly where friction and drool rash begin too — hence the confusion. The clue is persistence. Remove the obvious irritant and eczema stays put, then turns up somewhere else as well: the crooks of elbows and knees, the neck, the trunk.

What helps: Eczema is managed rather than cured. Frequent, generous moisturising with a plain emollient, short lukewarm baths, no soap or fragrance, and prescribed treatment during flares. Reducing mechanical irritation — rough fabrics, overheating, scratchy seams — supports all of that without replacing any of it.

See your GP: for any suspected eczema, without waiting. A proper diagnosis and a written management plan change the whole trajectory, and an untreated flare is a miserable business for everybody in the house. If your baby is scratching hard enough to break skin or lose sleep, bring the appointment forward.

Drool rash: teething’s red badge

Saliva contains digestive enzymes, which is marvellous in a stomach and less so on a chin. Left sitting for hours it breaks down the skin barrier, leaving flat red patches around the mouth and in the neck folds where drool gathers. It peaks with teething, and again around the age when everything within arm’s reach goes straight into the mouth.

What helps: Pat the area dry through the day rather than wiping, which only adds friction to the problem. Change damp bibs and clothing promptly. A barrier ointment before sleep buys the skin a few uninterrupted hours to repair itself.

See your GP if: it cracks, weeps, develops yellow crusting, or spreads well past where drool actually lands.

Friction rash: redness on one side only

This is the one most often mistaken for something else, and the one with the simplest tell.

When a baby turns their head against a mattress while settling, the contact side takes the rubbing. What you get is diffuse redness on one cheek, occasionally with a faint texture to it, usually worst on waking and fading over the following hour. Eczema and drool rash are broadly symmetrical. Friction is not — it follows the face wherever the face actually presses.

What helps: Take the friction out. Keep the sleep surface smooth, keep the room cool enough that the skin is not damp with sweat, and check that nothing textured — a seam, a stiff label, a coarse cotton twill — sits where the cheek lands. This is the one condition on this page where the fabric beneath your baby is genuinely part of the answer: a smoother, less absorbent surface such as a fitted silk cot sleeve reduces drag, and unlike cotton it will not spend the night wicking barrier cream off the skin. It will do nothing whatsoever for the other six.

See your GP if: the redness persists all day, becomes raw or broken, or turns up equally on both sides — which means you are looking at something else.

Heat rash: tiny prickly bumps

Miliaria happens when sweat ducts block and the sweat has nowhere to go. It shows as clusters of very fine bumps or clear blisters on the neck, back, chest and wherever clothing traps warmth, and it is a fixture of the Australian summer.

What helps: Cool the baby down. Fewer layers, breathable natural fabrics, a cooler room, a lukewarm bath. It generally clears within a day or two once the overheating stops.

Worth knowing: heat rash is a message. Overheating is itself a risk factor for sudden infant death, so treat it as a prompt to reassess bedding, layers and room temperature rather than simply something to soothe. The Red Nose safe sleeping guidelines set out appropriate layering.

Baby acne and milia: the ones that need nothing

Neonatal acne turns up in the first few weeks as small red or white pimples across the cheeks, nose and forehead — the last echo of maternal hormones working their way out. Milia are the tiny firm white spots caused by keratin caught just under the surface.

Both are entirely harmless and both resolve unaided: milia within weeks, acne within a few months. Do not squeeze them, scrub them, or reach for anything from the acne aisle. Plain water and patience is the whole protocol.

What about the nappy area?

Nappy rash is its own category with its own tell. Ordinary irritant nappy rash spares the skin folds. A rash that goes into the creases, sits bright red behind a well-defined edge, or scatters small satellite spots around itself suggests thrush, and wants an antifungal from your pharmacist or GP rather than more barrier cream.

The honest summary

Of everything on this page, exactly one condition is meaningfully influenced by what your baby sleeps on. Cradle cap, baby acne and milia need time. Eczema needs a plan from your doctor. Drool rash needs a dry chin. Heat rash needs a cooler room.

Friction is the one where the surface matters, and it is worth fixing — it is uncomfortable and entirely avoidable. But if a rash is not on the contact side and is not improving, new bedding is not your answer, and no product should be telling you otherwise.

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Frequently asked questions

How can I tell if it’s cradle cap or eczema?
Cradle cap is greasy, yellowish, scaly and mostly confined to the scalp, and it rarely bothers the baby. Eczema is dry rather than greasy, genuinely itchy, and typically appears on the cheeks and in the skin creases as well. A scratching baby points to eczema.

Is drool rash the same as eczema?
No. Drool rash is irritant contact dermatitis caused by saliva sitting on the skin, confined to where drool lands, and it improves when the area is kept dry. Eczema recurs regardless, appears in other locations, and is far itchier.

Why is my baby’s cheek red on one side only?
One-sided facial redness that is worst on waking is usually friction from the sleep surface. Symmetrical redness on both cheeks points to eczema, drool rash or another cause.

Does a silk cot sleeve help with baby eczema?
Not as a treatment. It reduces friction and does not absorb barrier creams the way cotton does, which can support skin that is being mechanically irritated. Eczema itself needs a management plan from your GP or dermatologist.

When should I take my baby to a doctor for a rash?
Immediately for any rash that does not fade under pressure from a glass, or that arrives with fever, breathing difficulty, unusual drowsiness or poor feeding. Otherwise, book an appointment for any rash that is spreading, weeping, crusting yellow, costing sleep, or not improving after a week of simple care.

Can teething cause a rash all over the body?
No. Teething can cause drool rash around the mouth and chin, but a widespread body rash is not caused by teething and should be assessed by a doctor.

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This guide is general information, not medical advice, and cannot diagnose your baby. If you are concerned about your baby’s skin, contact your GP, maternal child health nurse, or healthdirect on 1800 022 222.

Read next: Baby hair loss and sensitive skin at night: a complete guide for Australian parents · Does silk help baby eczema? What the research says · Baby cheek rashes and redness · How to install your cot sleeve safely

Most of what appears on a baby’s skin in the first year is the skin learning its job in public — loudly, visibly, and almost always temporarily. The trick is knowing which of it will sort itself out by Thursday, and which of it wants a doctor. Somewhere around the second or third of these, you stop reaching for the phone at half past two, and start reaching for the lamp instead.