What Does Diaper Rash Look Like?

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Ordinary diaper rash is flat or slightly raised pink-to-red skin on the parts that press against the diaper — buttocks, the outer genitals, the tops of the thighs — and it characteristically spares the deep creases, because the creases are where the diaper does not touch. That sparing is the single most useful identifying feature, and it is the one that separates it from the thing most often mistaken for it.

If the rash is worst inside the creases rather than outside them, you are probably not looking at irritant diaper rash at all.

What does ordinary irritant rash look like?

Pink or red, flat or a little shiny, over the convex surfaces the diaper presses on.
The skin folds at the top of the thighs and around the groin are clear or much less affected.
Edges are diffuse rather than sharply defined — it fades out rather than stopping in a line.
No pustules, no satellite spots, no scale.
It improves noticeably within two or three days of shorter change intervals, more drying time and a barrier cream.

How do you tell it apart from everything else?

What is in the diaper area: distinguishing features
	What it looks like	Where	Tell
Irritant diaper rash	Diffuse pink-red, slightly shiny	Convex areas; creases spared	Improves in days with changes and drying
Candida (thrush)	Beefy red, sharply edged, small satellite spots beyond the main patch	In the creases	Does not respond to barrier cream alone
Heat rash (miliaria)	Tiny clear or red pinpoint bumps	Neck, back, shoulders as well	Follows heat and sweating, not the diaper
Seborrhoeic dermatitis	Greasy yellow scale on salmon-pink skin	Creases, and often the scalp too	Cradle cap elsewhere at the same time
Eczema	Dry, scaly, intensely itchy	Rarely confined to the diaper area	Elbows, knees, cheeks affected too
Bacterial infection	Pustules, yellow crust, weeping	Anywhere in the area	Needs a doctor, not a cream

Creases spared, think irritant. Creases worst, with small spots scattered beyond the edge, think thrush — and that one needs an antifungal rather than a barrier.

How bad is it?

Mild is pink, dry, and limited to a small area — she is unbothered during changes. Moderate is redder over a wider area, slightly raised, and she objects when you clean her. Severe is raw, weeping, broken or ulcerated skin, and it is painful; that stage is not something to keep treating at home.

A useful marker in between: a rash that has not begun to improve after three days of doing everything right is not a rash you are going to fix by continuing to do everything right.

What does it look like in this climate specifically?

Wetter and less well defined. In 80% humidity the skin under a diaper never fully dries, so the classic textbook picture of a dry pink patch is often replaced by something shinier, more macerated, and quicker to break down. Heat rash frequently sits on top of it, which is why the diaper area here so often shows two things at once.

The two that overlap here

When should you see a doctor?

Skin that is broken, weeping, blistered or ulcerated.
Pustules, yellow crusting, or a rash that is spreading beyond the diaper area.
A bright red rash in the creases with satellite spots, which usually needs an antifungal.
No improvement after three days of shorter intervals, drying and barrier cream.
Fever, an unusually unsettled baby, or a rash that seems disproportionately painful.
Any rash in a baby under six weeks that is more than mild.

We can tell you what a rash tends to look like. We cannot tell you what yours is, and photographs on the internet are a poor substitute for someone looking at the actual skin. Polyclinics and GPs see this several times a day and are not remotely bored by it.

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