A red, sore patch on a baby or toddler's skin is one of the most common reasons parents end up searching the internet at eleven at night. Is it nappy rash? Is it eczema? Could it be both? The two can look surprisingly similar in photos, but they usually behave differently, show up in different places, and respond to different everyday care. Here's how to start telling them apart, and what tends to help either way.
Nappy Rash: What It Typically Looks Like
Nappy rash is skin irritation caused by prolonged contact with wee, poo, moisture and friction inside the nappy. It usually appears as shiny, red, slightly puffy skin across the areas that actually touch the nappy: the bottom, the upper thighs, and the genital area. A useful pattern to notice is that nappy rash tends to spare the deep skin folds and creases, since those areas have less direct contact with a wet or soiled nappy. It often develops quickly, sometimes within a day of a bout of teething, illness, or a change in diet that leads to looser nappies.
Eczema in Babies and Toddlers: What It Typically Looks Like
Eczema in babies most commonly appears on the cheeks, scalp, chest, and the outsides of the elbows and knees, though it can show up anywhere, including inside the nappy area. It tends to look dry, patchy, and rough rather than shiny, and the skin often looks slightly thickened or scaly in patches that have been affected for a while. Unlike nappy rash, eczema often does affect skin folds, particularly behind the knees, inside the elbows, and around the wrists and ankles. It also tends to build up more gradually and flare and settle over weeks rather than appearing overnight.
Why the Two Get Confused
The confusion mostly happens because eczema can develop inside the nappy area too, and a baby who already has eczema elsewhere on their body is often more prone to a stubborn nappy rash, since their skin barrier is already more reactive. It's entirely possible for a baby to have ordinary nappy rash on the bottom and eczema patches on the cheeks and elbows at the same time, which is one reason parents often feel like they're fighting two different rashes rather than one.
Nappy Rash vs Eczema: A Quick Comparison
| Feature | Nappy Rash | Eczema |
|---|---|---|
| Typical location | Bottom, thighs, genital area (inside the nappy) | Cheeks, scalp, elbows, knees, wrists, ankles, sometimes the nappy area too |
| Skin folds | Usually spared | Often affected, especially behind knees and inside elbows |
| Appearance | Shiny, red, slightly puffy | Dry, patchy, rough, sometimes scaly or thickened |
| Onset | Can appear within a day | Builds gradually, flares and settles over weeks |
| Main trigger | Prolonged contact with wee, poo and moisture | Dry skin, irritants, weather, and a more reactive skin barrier |
What Helps Nappy Rash Day to Day
- Change nappies frequently, even overnight if the rash is active
- Give some nappy-free time each day to let air reach the skin
- Pat the area dry rather than rubbing after every change
- Use plain water or fragrance-free wipes instead of scented ones
- Apply a thin layer of barrier cream at each change once the rash appears
What Helps Eczema-Prone Baby Skin Day to Day
- Keep baths short and lukewarm rather than long and hot
- Use a fragrance-free wash rather than ordinary bubble bath or soap
- Moisturise generously, ideally straight after bathing while skin is still damp
- Choose soft, breathable fabrics like cotton next to the skin
- Keep an eye on obvious triggers, such as overheating, wool, or a change in weather
If you're introducing anything new to a baby or toddler's skin, whether that's a fragrance-free moisturiser or a barrier cream, it's worth patch testing on a small area first and leaving it for a day to check for any reaction, and speaking with your health visitor or GP if you're ever unsure whether a product is suitable for your child's age and skin.
Frequently Asked Questions
Can a baby have nappy rash and eczema at the same time?
Yes. It's common for a baby with eczema elsewhere on their body to also develop a more stubborn nappy rash, since their skin barrier is already more reactive to moisture and irritation.
Does nappy rash ever affect the skin folds?
It can in more severe cases, but nappy rash typically spares the deep skin folds and creases, unlike eczema, which often shows up specifically in folds like behind the knees and inside the elbows.
How long does nappy rash usually take to clear up?
With frequent nappy changes, nappy-free time and a barrier cream, mild nappy rash often improves within a few days. If it hasn't improved after that, it's worth checking with a GP or health visitor.
Is it safe to use a fragrance-free moisturiser on a baby's eczema-prone skin?
Fragrance-free moisturisers are generally well tolerated, but it's sensible to patch test any new product on a small area first and to check with your health visitor or GP, particularly for very young babies.
What makes baby eczema flare up?
Common triggers include dry air, overheating, wool or rough fabrics, fragranced products, and changes in weather, though triggers can vary quite a bit from one child to another.
The Bottom Line
Nappy rash and baby eczema can look similar at a glance, but they usually differ in where they appear, how they develop, and what settles them. Nappy rash responds to frequent changes, air time and a barrier cream, while eczema-prone skin tends to need gentle bathing and regular moisturising as an ongoing routine rather than a one-off fix. When in doubt, or if a rash isn't improving, a GP or health visitor is always the right next step for a baby or toddler's skin.
Sources
- NHS, "Nappy rash"
- NHS, "Atopic eczema"
- National Eczema Society, "Childhood eczema"
Ashleigh is not a medical professional and this article is not medical advice. It reflects personal and customer experience alongside published NHS and dermatology guidance. Ashleigh's Organics Body Butter is a cosmetic product, not a medicine, and is not intended to diagnose, treat, cure or prevent eczema, nappy rash or any other medical condition. If your baby or toddler has a persistent or worsening rash, please follow the guidance given by your GP, dermatologist or health visitor.