Impetigo in Children: Symptoms, Treatment and When to Worry

Impetigo looks alarming and spreads fast, but it is one of the most treatable skin infections children get. Here is the short version:

• It is a bacterial skin infection, usually Staphylococcus aureus or Streptococcus pyogenes, most common in children aged 2 to 5 (NHS).
• The classic sign is a honey-colored crust, often around the nose and mouth, on top of red sores or burst blisters.
• With antibiotics it clears in about 7 to 10 days, and a child stops being contagious roughly 24 to 48 hours after treatment starts (CDC).
• It spreads by contact and through broken skin, not by dirty water on its own.

That last point matters, because impetigo travels through touch: a scratched insect bite, a patch of eczema, a runny nose wiped with the back of a hand. This guide covers what it looks like, how contagious it really is, what treatment involves, and the handful of signs that mean call the doctor today.

Quick Reference: impetigo vs. common look-alikes

If you are staring at a rash and cannot place it, our guide to baby rash types with pictures walks through the visual differences side by side.

What does impetigo look like?

It usually starts as a small red sore or a cluster of tiny blisters. Within a day or two the blisters burst, leak a bit of fluid, and dry into that unmistakable crust the color of dried honey. The most common spot is the face, around the nose and mouth, but it turns up anywhere skin is broken: hands, the edge of a scraped knee, a scratched bite behind the ear.

There are two forms. Non-bullous impetigo, the far more common one, is the crusty kind described above. Bullous impetigo produces larger, fluid-filled blisters that linger a little longer before they pop, and it shows up more often in babies and toddlers. Both are usually not painful, though they can be itchy, and the itch is exactly how it spreads to a new patch of skin.

Is impetigo contagious, and for how long?

Very. It passes through direct contact with the sores or with anything they have touched: a shared towel, a pillow, a favorite toy, the strap of a car seat. In a house with siblings, or a daycare room full of hands, it moves quickly.

The good news is that treatment shortens the contagious window sharply. Once a child has been on antibiotics for 24 to 48 hours, they are generally no longer infectious and can return to daycare or school (CDC). Left untreated, impetigo stays contagious until every sore has fully crusted and healed, which can take a couple of weeks. That difference, days versus weeks, is most of the reason to get it treated rather than wait it out. Group settings are also why a cold or scrape picked up at nursery so often turns into something more; our piece on why kids get sick so often at daycare covers that churn.

What causes it, and why does it seem to spike in summer?

The bacteria that cause impetigo live harmlessly on many people's skin and in noses. They only cause trouble when they get through the skin barrier, so anything that breaks the skin is an open door: insect bites, cuts and grazes, eczema, even the raw skin under a runny nose. This is why children with eczema or lots of summer bug bites are more prone to it.

Summer stacks the odds. Heat and sweat, more bare skin, more scrapes, and hours of close contact at pools and beaches all help it spread. Parents sometimes hear that impetigo comes from "dirty water," and it is worth being precise here: impetigo is passed person to person, not caught from the sea itself. Poor water quality can irritate or infect already-broken skin, but the infection is a contact one. The practical takeaway is simple. If your child has open sores, keep them out of shared water until the skin has healed and is covered, both to protect their skin and to avoid passing it on.

How is impetigo treated?

A doctor can usually diagnose it by looking. For a mild, localized case, a prescription antibiotic cream (commonly mupirocin) applied for about five days clears it in most children. When impetigo is widespread, spreading, or not responding to the cream, oral antibiotics are the next step (NHS). Finish the full course even after the sores look healed, because stopping early is how it comes back.

Skip the drugstore antiseptic creams as a standalone fix. They do not reliably clear the infection, and delaying real treatment just widens the contagious window.

Home care: how to stop it spreading

Treatment handles the infection; hygiene handles the household.

• Wash the crusts gently with warm water and a clean cloth once a day to loosen them, then pat dry.
• Keep sores loosely covered with gauze where you can, so fingers stay off them.
• Cut fingernails short and wash hands often, both yours and your child's. Scratching is the number one way it jumps to a new spot.
• Give your child their own towel, flannel, and pillowcase, and wash them hot, separately, daily.
• Keep them home from daycare or school until 24 to 48 hours after antibiotics start.

Do not send them back the morning after the first dose because the sores look better. Better is not the same as no longer contagious.

Decision logic: treat at home, or call?

• If there are a few crusted sores and your child is well, book a routine pediatrician visit to get the antibiotic. This is not an emergency, but it does need a prescription.
• If sores are spreading, numerous, or on a baby under three months, call the same day.
• If the skin around them is red, hot, swollen and tender, that can mean the infection has gone deeper (cellulitis), and needs prompt assessment.
• If your child is feverish, floppy, or generally unwell, treat that as a reason to be seen quickly, not to wait.

Common mistakes parents make

• Waiting it out. Impetigo can clear on its own eventually, but untreated it stays contagious for weeks and spreads to siblings. Treatment is faster and kinder to everyone.
• Scrubbing the crusts off. Gentle loosening is fine; picking and scrubbing spreads bacteria and can scar.
• Reusing towels and bedding. This is how one sore becomes five, and how a sibling catches it.
• Stopping antibiotics early. The sores heal before the bacteria are fully gone. Finish the course.
• Confusing it with a cold sore or eczema and treating the wrong thing. When in doubt, our rash types guide helps you tell them apart before the visit.

When to seek professional help

See your pediatrician to confirm impetigo and get the right antibiotic. Seek care sooner, the same day, if your child has a fever, if the redness is spreading beyond the sores, if there are many lesions or they are worsening despite treatment, or if your baby is under three months old.

Two rare complications are worth knowing without losing sleep over. Impetigo can occasionally deepen into cellulitis, and a small number of strep-related cases are followed weeks later by a kidney problem that shows up as dark or reduced urine (CDC). Both are uncommon; both are reasons to call rather than panic. To make any visit count, walking in with a short record of when the sores started and how they have changed helps the doctor decide fast, which is the whole idea behind preparing for a pediatric visit with your child's data.

Frequently asked questions

How long is a child with impetigo contagious?
Until about 24 to 48 hours after antibiotics start, or, if untreated, until every sore has fully crusted and healed, which can take up to two weeks. Treatment is the fastest way to end the contagious period.

Can my child go to daycare or school?
Not until 24 to 48 hours after starting antibiotics, and once any weeping sores are covered. Most nurseries follow this rule, so a quick note from your pediatrician helps.

Will impetigo leave a scar?
Usually not, if it is treated and the crusts are left to heal rather than picked. Scarring is far more likely from scratching than from the infection itself.

Can adults catch it from their child?
Yes, though it is less common in adults. The same hygiene, separate towels, handwashing, covering sores, protects the rest of the household.

Is it safe to swim with impetigo?
No. Keep your child out of pools and the sea until the sores have healed and are covered. It protects their broken skin and stops them passing it to other children.

Can I use just an antiseptic cream from the pharmacy?
No. Over-the-counter antiseptics do not reliably clear impetigo. It needs a prescription antibiotic, so a doctor visit is the right first step.

How KidyGrow helps you

A skin thing that spreads is hard to track by memory. Did the second sore appear before or after the beach day? Is it actually improving on the cream, or does it just feel that way because you want it to?

KidyGrow holds that thread for you. If you note the first sore and add a quick photo or line each day, the app keeps the timeline in one place, so by day three you are reading an actual before-and-after instead of guessing. When the pediatrician asks "when did it start and how has it changed," the answer is right there. The app does not diagnose skin infections, and it will not replace the visit that gets you the antibiotic. What it does is stop the "I think it started Tuesday, or was it Monday" fog, and remember which days your child ran a temperature alongside the rash.

Give it a few days of notes before you expect much back. Early on it is just holding the record. By the end of a week it can line up the fever days, the new sores, and the start of treatment, so you walk into the appointment with two minutes of real observation instead of a blur.

Sources

1. NHS. "Impetigo." https://www.nhs.uk/conditions/impetigo/
2. Centers for Disease Control and Prevention. "Impetigo: All You Need to Know." https://www.cdc.gov/group-a-strep/about/impetigo.html
3. Centers for Disease Control and Prevention. "Group A Streptococcal (GAS) Disease." https://www.cdc.gov/group-a-strep/
4. World Health Organization. "Bacterial skin infections in children." https://www.who.int