Diaper Rash in Babies: Causes, Types, Treatment, and Prevention

Diaper rash is irritated skin in the area covered by a diaper. Most cases are mild. Friction and prolonged contact with wetness cause them. They clear up in about 2 to 3 days with frequent diaper changes, gentle cleaning, and a thick barrier cream. Some diaper rashes need a pediatrician: yeast, bacterial, severe, or any rash that will not go away.

What Is Diaper Rash?

Diaper rash is skin inflammation in the area a diaper covers, usually pink or red patches on a baby's bottom, genitals, or thighs. Doctors call it diaper dermatitis. Most cases come from ordinary wear and tear on the skin, not infection.

At least half of all babies get a diaper rash at some point. It is one of the most common reasons parents seek pediatric care, and most cases respond to small changes in the diapering routine at home.

What Causes Diaper Rash?

Diaper rash is usually caused by prolonged contact with urine, stool, and friction inside a wet diaper, which breaks down the skin's barrier. Other triggers include new products, antibiotics, food sensitivities, and yeast or bacterial infection. Knowing which trigger fits helps you pick the right treatment and decide when to call the pediatrician.

Moisture, friction, and irritation

The most common cause is irritant dermatitis from prolonged wetness. Urine and stool sit against the skin, soften it, and break down its protective barrier. Friction from a tight diaper or active crawling speeds this up. Babies with diarrhea are especially prone because of frequent, acidic stool. The first line of treatment is almost always the same: more frequent changes and a thick barrier cream.

New products, foods, or antibiotics

A change in routine can also kick off a diaper rash. New diapers or wipes may contain fragrances, preservatives, dyes, or elastics that irritate a baby's skin. Starting new solid foods can change stool composition and trigger a flare. Some parents report flares after acidic foods like tomato or citrus. A course of antibiotics can disrupt the gut's bacteria and let yeast take over. This is true for the baby's own antibiotics or, if breastfeeding, the parent's. Teething can coincide with diaper rash because of changes in saliva and stool. We cover that overlap in our full guide on diaper rash and teething.

Yeast and bacterial infection

Sometimes a diaper rash is not irritation. It is a true infection of the skin. Yeast (Candida) is the most common one. It often follows a course of antibiotics, or develops when a rash has not cleared with standard care. Bacteria can also infect the skin. Staphylococcus aureus produces weepy yellow crusts. Group A streptococcus produces a sharply outlined bright red patch around the anus. Any infection in the diaper area must be confirmed and treated by your child's doctor.

Types of Diaper Rash and How to Tell Them Apart

Diaper rashes fall into four main types: irritant, yeast (Candida), bacterial (strep or staph), and allergic or contact rashes. Most parents will only ever see one or two kinds. Recognizing the pattern matters because each type needs a different fix: irritant rashes clear with barrier cream, yeast and bacterial rashes need a prescription, and allergic rashes clear once the trigger product is removed.

Irritant diaper rash

This is the everyday rash and by far the most common type. It shows up as pink or red patches on the convex, exposed parts of the bottom. Think cheeks, lower belly, genitals, and upper thighs. A key clue: the deep skin folds of the groin look normal. The diaper does not press against those folds. Irritant rashes respond quickly to good home care. That means more frequent changes, gentle cleaning with water or a fragrance-free wipe, and a thick layer of zinc oxide or petroleum-based barrier cream.

Yeast (Candida) diaper rash

Yeast diaper rash, also called candidiasis (a yeast infection), looks different. The patches are shiny, bright red or pink with sharp, well-defined edges. Just outside the main rash, you will often see small pink bumps or pimples. These are called satellite lesions. The rash is worse in the deep skin folds, exactly where an irritant rash is mild. Severe yeast rashes can show sores or cracking skin that oozes or bleeds. Yeast does not clear with barrier cream alone. Your pediatrician may prescribe a topical antifungal cream such as nystatin, clotrimazole, or miconazole. Continue the barrier cream on top to protect the skin.

Bacterial diaper rash

Bacterial infections in the diaper area are less common but important to recognize. Perianal strep produces bright red skin around the anus, sharply outlined, often painful with bowel movements. Staphylococcus aureus can cause impetigo, which looks like red oozing patches that dry into yellow or honey-colored crusts. Both infections are contagious. Both are confirmed and treated by a pediatrician with antibiotics. Topical mupirocin works for limited impetigo. An oral antibiotic is used for spreading or severe infection. Finish the full antibiotic course exactly as prescribed.

Allergic or contact diaper rash

Sometimes the culprit is a specific product, not wetness or infection. Dyes and elastics in a diaper can irritate the skin. So can fragrances or preservatives in wipes and creams. The diagnostic clue is a rash that lines up exactly with where the product touches the skin. It may flare every time you use that product. The fix is detective work. Switch brands or types of products for a 2-week period and watch for the rash to clear. Pair the switch with the same gentle cleaning and barrier-cream routine.

Other rashes in the diaper area

Not every rash on a baby's bottom is a diaper rash. Eczema usually does not develop in the diaper area, because that skin is generally too warm and moist for eczema patches. Eczema more often shows up on the face, scalp, and the inner creases of the elbows and knees. For help telling these apart, see our guide on baby eczema vs. other skin conditions and our eczema treatment guide for babies. Heat rash (small clear or pink bumps in hot, sweaty weather) can also turn up in the diaper area. So can seborrheic dermatitis (greasy yellow scales). If a rash on the bottom does not look like the patterns above, or it spreads beyond the diaper, ask your pediatrician.

Yeast Diaper Rash vs. Regular Diaper Rash

A yeast diaper rash sits in the deep skin folds and does not clear with barrier cream; an irritant rash spares the folds and clears with it. Telling the two apart is one of the most useful skills a parent can learn. Yeast rashes are shiny and bright red with sharp edges and small satellite bumps. Irritant rashes are pink or red patches on the convex, exposed skin.

If a rash has lived in the skin folds for more than 2 to 3 days, suspect yeast. The same is true for a rash that has not budged with consistent barrier cream. Call your pediatrician for an antifungal.

How to Treat Diaper Rash at Home

Most diaper rashes clear in 2 to 3 days with frequent diaper changes, gentle cleansing, and a thick zinc oxide or petroleum barrier cream. Be consistent with the routine, even after the rash starts to fade. Treatment also means skipping things that can make a rash worse, like OTC antibiotic ointments, cornstarch, talc-based powders, and "all-natural" home remedies.

• Change diapers more often. Wet or soiled diapers are the main driver of diaper rash. Check every 1 to 2 hours during the day and at every nighttime feeding.
• Clean the diaper area gently. Use water and a soft cloth, or an alcohol-free and fragrance-free wipe. For a sore or open rash, a squirt or spray bottle of plain warm water rinses the skin without rubbing.
• Pat dry, do not rub. If you can, leave the diaper off for a minute or two. Air time helps the skin recover.
• Apply a thick barrier cream. Use zinc oxide or petrolatum (petroleum jelly), fragrance-free, applied like icing on a cupcake at every change. The cream shields the skin from moisture. You do not need to scrub it all off at the next change. Gently wipe stool off the top and add more.
• Bathe daily. A short daily bath with a mild, fragrance-free cleanser removes irritants and helps the skin heal.
• Skip OTC antibiotic ointments. The American Academy of Pediatrics is direct on this point: "Do not use over-the-counter antibiotic ointment for diaper rashes; sometimes ingredients in these products can worsen skin irritation."
• Skip cornstarch, talc, and home remedies. Cornstarch may worsen a yeast rash (Candida). Talc-based powders can be inhaled and damage a baby's lungs. Baking-soda baths and other "all-natural" fixes are not part of pediatric guidance.

If the rash has not improved after 2 to 3 days of this routine, call the pediatrician. Distinguishing a simple irritant rash from a yeast or bacterial rash is one of the most common reasons parents start a Blueberry telehealth visit. Many arrive after a standard diaper cream "stopped working," which is itself a clue the rash is yeast.

How to Prevent Diaper Rash

Most diaper rashes are prevented by changing wet or soiled diapers quickly and applying a thin layer of barrier cream at every change. You cannot prevent every diaper rash, but a few simple daily habits keep most of them from starting. Keep the skin clean and dry, choose fragrance-free wipes and diapers, and pay close attention during teething, antibiotics, or a new food.

• Change wet or soiled diapers as soon as you can.
• Clean the diaper area with water or a fragrance-free, alcohol-free wipe at every change.
• Pat the skin dry, and let it air out for a minute or two when possible.
• Apply a thin layer of zinc oxide or petroleum-based barrier cream at every change if your baby is prone to rashes. Use it overnight when diapers stay on longer.
• Use a highly absorbent diaper that fits well but is not too tight. Tight diapers trap moisture and rub against the skin.
• Bathe daily with a mild, fragrance-free cleanser.
• Wash your hands before and after every diaper change. This protects the baby, and it protects you.

There is no clear evidence that cloth or disposable diapers prevent rash better than the other. Disposables are usually more absorbent, so cloth diapers may need more frequent changes. Pick what works for your family, and change diapers often.

Severe Diaper Rash and a Rash That Won't Go Away

A diaper rash is "severe" when the skin is broken, bleeding, blistering, or so red and raw that touching it makes the baby cry. A rash that has not gone away after 2 to 3 days of consistent home care deserves the same level of attention. So does a rash that keeps coming back as soon as you stop the barrier cream.

A few common reasons a rash will not clear:

• It is yeast, not irritation. Barrier cream alone is not enough; yeast needs a prescription antifungal.
• It is a contact allergy. The rash flares every time you use a particular wipe, cream, or diaper brand.
• It is bacterial. The rash has yellow or honey-colored crusts, pus, or a sharply outlined red patch around the anus.
• The barrier is not thick enough. A thin smear washes off in one diaper. Use a thick paste.
• Changes are not frequent enough. Long stretches between changes will undo good treatment.

"Won't go away" is not a sign that you need a stronger product. It is a diagnostic clue that the rash is something other than basic irritation. Loop in your pediatrician so the right treatment can start.

When to Call Your Doctor About Diaper Rash

Call your pediatrician if a diaper rash has not improved after 2 to 3 days of home care, has blisters or pus, comes with a fever, or keeps returning. Specifically, call if you see any of the following:

• A diaper rash that has not improved after 2 to 3 days of standard home care.
• A rash with blisters, pus-filled or oozing sores, peeling skin, or yellow or honey-colored crusts.
• A rash with a fever.
• A rash that is bright red with sharp edges, with small pink bumps just outside the main rash. This can be a yeast infection.
• Bright red skin around the anus, especially if it is painful with bowel movements. This can be a strep infection.
• A rash that is very painful, even when the diaper is off.
• A baby who is unusually fussy, lethargic, or feeding poorly along with the rash.
• A rash that started or got much worse during or just after a course of antibiotics.
• A rash that keeps coming back after each round of home care.

Telehealth can handle most diaper rashes. That includes a suspected yeast rash that needs an antifungal prescription. An in-person visit is the right choice in a few cases: spreading redness, a fever, blisters with pus, or a baby who is lethargic or feeding poorly. When in doubt, message your pediatrician. You do not have to be sure of the diagnosis to ask.

How Blueberry Pediatrics Can Help

Blueberry pediatricians diagnose and treat diaper rash by telehealth in minutes: send a photo, talk through the timeline, and get a plan. Diaper rash is one of the most common questions Blueberry parents bring to a visit, and one of the easiest to handle remotely. We can tell you whether it is an irritant rash, a yeast rash that needs a prescription, or something that should be seen in person. With Blueberry's $35-a-month plan, every visit is included. There are no co-pays and no per-visit charges. You can reach a pediatrician 24/7 by text or video, which matters when a rash flares at 2 a.m. or on a Sunday.

Frequently Asked Questions

What does diaper rash look like, and how do I know it is diaper rash?

A diaper rash usually shows up as pink or red patches in the area a diaper covers: the bottom, genitals, lower belly, and upper thighs. The skin may feel warm or tender. If the redness fits roughly inside the diaper outline, it is almost certainly a diaper rash.

What causes diaper rash?

The most common cause is prolonged contact with urine, stool, and friction from a wet diaper. That breaks down the skin's protective barrier. Other causes include a new product, antibiotics, diarrhea, food sensitivities, yeast overgrowth, and bacterial infection.

How do I tell a yeast diaper rash from a regular (irritant) diaper rash?

Three clues. Location: yeast lives in the deep skin folds; irritant rashes spare the folds. Appearance: yeast is shiny and bright red with sharp edges and small "satellite" bumps. Response: yeast does not clear with barrier cream alone. If the rash sits in the folds or has not improved after 2 to 3 days of standard care, suspect yeast.

How do you treat diaper rash at home? Which creams work best?

Change diapers more often. Clean the skin gently. Pat dry. Apply a thick layer of zinc oxide or petroleum-based barrier cream (like icing on a cupcake) at every change. Stick with fragrance-free products. Skip OTC antibiotic ointments, cornstarch, and talc-based powders.

How long does diaper rash take to go away?

Most irritant diaper rashes improve within 2 to 3 days of consistent home care. Yeast and bacterial rashes take longer because they need a prescription, but they also improve quickly once the right treatment starts.

What if the diaper rash won't go away or keeps coming back?

A rash that lingers past 2 to 3 days, or that returns again and again, is telling you something. The cause is usually yeast, an allergic reaction, or a bacterial infection. Loop in your pediatrician rather than trying a stronger over-the-counter product.

What does a severe diaper rash look like, and is it dangerous?

A severe rash has broken or bleeding skin, blisters, pus, deep redness in the skin folds, or pain when touched. Severe rashes are not usually dangerous on their own. The skin can get infected, though. A few patterns need fast pediatric care: a sharply outlined patch around the anus, honey-colored crusts, or fever with the rash.

When should I see a doctor or pediatrician about a diaper rash?

Call your pediatrician if the rash has not improved after 2 to 3 days of standard care. The same is true if it has blisters or pus, looks like yeast or strep, is very painful, or keeps coming back, or if your baby has a fever. Telehealth is fine for most of these. An in-person visit is the right choice for spreading redness, fever, lethargy, or poor feeding.

Can diaper rash get infected?

Yes. Any break in the skin can be entered by yeast or bacteria. A rash may be infected if it looks worse, oozes, develops yellow crusts, or has sharply outlined bright red areas in the folds or around the anus.

What is the best way to prevent diaper rash?

Change diapers as soon as they are wet or soiled. Clean gently with water or a fragrance-free wipe, pat dry, and apply a thin layer of zinc oxide or petroleum-based barrier cream at every change. Daily baths, well-fitting absorbent diapers, and handwashing help too.

Are cloth or disposable diapers better for preventing diaper rash?

There is no strong evidence that one prevents diaper rash better than the other. The most important factor is how often the diaper is changed. Cloth diapers are usually less absorbent than disposables, so they may need more frequent changes.

Should I use cornstarch or baby powder on a diaper rash?

No. Cornstarch may worsen a yeast rash (Candida). Talc-based powders carry an inhalation risk and can damage a baby's lungs. A thick fragrance-free zinc oxide or petroleum-based barrier cream is the safer choice.

Sources

American Academy of Pediatrics, "Diaper Rash" (HealthyChildren.org), updated December 18, 2024.

American Academy of Pediatrics, "Impetigo" (HealthyChildren.org).

American Academy of Pediatrics, "Eczema" (HealthyChildren.org).

Centers for Disease Control and Prevention, "About Candidiasis."

Centers for Disease Control and Prevention, "About Impetigo" (Group A Strep).

Medical Disclaimer

This article is for educational purposes only and does not replace medical advice from your child's pediatrician. If your baby has a diaper rash that is severe, painful, oozing, or paired with a fever, contact your pediatrician right away. Blueberry Pediatrics members can start a telehealth visit any time, day or night.