You notice a small red spot near your kid’s nose. A day later it’s oozing. By day three, it’s crusted over in a color you’ve never seen a rash turn before — somewhere between amber and honey. That specific detail is usually the moment parents (and plenty of adults) start searching for answers.
Impetigo symptoms start as small red sores, most often around the nose and mouth, that rupture within a day or two and dry into a distinctive honey- or golden-colored crust. The sores are usually more itchy than painful, can spread to other areas through touching or scratching, and may come with mild fever or swollen glands in more serious cases. A less common form causes larger, fluid-filled blisters instead of crusted sores.
What Is Impetigo, Exactly?
Impetigo is a contagious bacterial infection that involves the superficial layers of the skin. It’s caused by one of two bacteria — Staphylococcus aureus or Streptococcus pyogenes — and it’s common enough that it’s sometimes just called “school sores,” since it’s very common and mainly affects children.
It shows up most often in kids ages 2 to 5, but adults can catch it too. It’s not usually dangerous, but it is one of the more contagious skin conditions out there, which is exactly why recognizing the symptoms early — and knowing what stage you’re looking at — matters.
There are three recognized forms, and each one looks and behaves a little differently:
- Non-bullous impetigo — the classic, crusty version, and by far the most common
- Bullous impetigo — larger, soft blisters instead of crusted sores
- Ecthyma — a deeper, more painful form that can leave lasting marks
Non-Bullous Impetigo Symptoms (the Common Kind)
This is the version most people picture when they hear “impetigo.” The symptoms begin with red sores — usually around the nose and mouth, though other areas of the face and the limbs can also be affected.
Here’s how it typically progresses:
- A small cluster of red sores or bumps appears, often near the nose or mouth.
- The sores quickly rupture and ooze for a few days.
- They burst and leave behind thick, golden crusts, typically around 2cm across — often described as looking like cornflakes stuck to the skin.
- After the crusts dry and fall away, they leave a red mark that fades without scarring, usually within a few days to a few weeks.
In most kids, impetigo first appears near the nose and then spreads through scratching to other parts of the face, arms, or legs — which is exactly why keeping little hands off the sores is such a common piece of advice from pediatricians.
Quick takeaway: If you’re staring at a sore wondering whether it’s impetigo, the honey/golden crust after oozing is the single most identifying feature. Almost no other common rash does that.
Bullous Impetigo Symptoms
Bullous impetigo behaves differently from the start. Instead of small sores that crust quickly, it causes fluid-filled blisters, often on the trunk, arms, and legs of infants and children younger than 2 — though older kids and adults can get it too.
What to expect:
- Fluid-filled blisters (bullae) about 1cm to 2cm across, usually on the central body between the waist and neck, or on the arms and legs
- The blisters start out fragile with clear fluid that often turns cloudy
- They may spread before bursting after several days, leaving a yellow crust that usually heals without scarring
- Fever and swollen glands are more common with this type than with the non-bullous kind
Because bullous impetigo is caused almost exclusively by S. aureus, it tends to run a slightly different course than the strep-driven, crustier version — one more reason a doctor’s diagnosis is worth getting rather than guessing from a photo online.
Ecthyma — When Impetigo Goes Deeper
Ecthyma is impetigo’s more serious cousin. It’s a form of impetigo that penetrates deeper into the skin, causing painful fluid- or pus-filled sores that turn into deep ulcers rather than surface crusts.
These lesions most commonly appear on the legs or feet, break open, and scab over with a hard yellow-gray crust — and they can cause swollen lymph glands in the affected area. Unlike ordinary impetigo, ecthyma is genuinely painful, not just itchy, and it’s more likely to leave a scar behind once it heals.
Is Impetigo Itchy, Painful, or Both?
This is one of the most searched — and most inconsistently answered — questions about impetigo, so it’s worth being precise.
For the common, non-bullous form: itching and soreness are generally mild. The sores themselves usually aren’t painful, though they can be itchy — and resisting the urge to scratch matters, because touching or scratching the sores can spread the infection to other parts of the body and to other people.
Bullous impetigo shifts that balance a little: the blisters may be painful, and the surrounding skin may be itchy. Ecthyma is the outlier — those deep sores are genuinely painful, not just an itchy nuisance.
Impetigo Symptoms in Adults vs. Children
Impetigo has a reputation as a “kids’ rash,” and statistically that’s fair — but adults aren’t immune, and their symptoms can look slightly different.
| Children | Adults | |
|---|---|---|
| Most common form | Non-bullous, especially ages 2–5 | Non-bullous, though bullous cases also occur |
| Typical trigger | Close contact at daycare/school, minor cuts, insect bites | Contact sports, shaving nicks, eczema, crowded living situations |
| Fever/swollen glands | More common in bullous cases | Less common overall, but complications tend to run more serious when they occur |
| Complication risk | PSGN more common in young, school-age children | Rare, but post-streptococcal glomerulonephritis can be fatal in adults, although deaths in children are rare |
Athletes such as football players and wrestlers are a notable adult risk group, since impetigo spreads easily through direct skin contact — one reason it sometimes gets nicknamed a “mat rash” in wrestling circles.
How to Tell Impetigo Apart From Other Rashes
Because impetigo’s early stage — a few red bumps — can look like a dozen other things, here’s a fast way to sort it out.
Impetigo vs. Ringworm
Ringworm forms a scaly, expanding ring with a clear center. Impetigo doesn’t form rings; it forms oozing sores that crust over in that honey/golden color. Ringworm is fungal, not bacterial, so it won’t respond to antibiotics at all.
Impetigo vs. Cold Sores
Cold sores (herpes simplex) cluster tightly around the lip line, sting or tingle before they appear, and crust with a darker, drier scab. Impetigo can appear near the mouth too, but its crust is thicker, moister-looking, and more golden — and it spreads more readily to other body parts through scratching.
Impetigo vs. Eczema Flare-Up
Eczema is usually dry, scaly, and chronic, flaring in the same spots (elbow creases, behind knees) over time. Impetigo is acute — it shows up, oozes, crusts, and resolves within a few weeks. That said, eczema patches are a common entry point for the bacteria that cause impetigo, so it’s possible to have both at once, which is exactly the kind of case worth a doctor’s look rather than a guess.
How Long Symptoms Last & How Contagious Impetigo Is
Left untreated, impetigo isn’t usually dangerous, but it does take longer to resolve and stays contagious longer. Without treatment, the infection typically heals in 14 to 21 days, and roughly 20% of cases resolve on their own.
With antibiotics, things move faster: cure typically occurs within 10 days of starting treatment, and contagiousness drops off fast. Keep affected people home from school or day care until they’re no longer contagious — usually about 24 hours after starting antibiotics. Cleveland Clinic notes the infection stays contagious until the rash disappears, the scabs fall off, and at least two days of antibiotics are complete.
It spreads easily, too — the bacteria that cause impetigo can live on dry surfaces for weeks or even months, which is why shared towels, pillowcases, and sports equipment are common culprits in household or team outbreaks.
Warning Signs: When Symptoms Point to a Complication
Most cases of impetigo clear up without any drama. But a small percentage of infections — particularly the strep-driven kind — can trigger complications, and it helps to know what those look like, because the symptoms show up somewhere other than the skin.
Complications of impetigo can include cellulitis, scarlet fever, guttate psoriasis, septicemia, staphylococcal scalded skin syndrome, and post-streptococcal glomerulonephritis (PSGN) — a rare kidney complication.
PSGN is the one worth knowing the symptoms of specifically, because it doesn’t look like a skin problem at all:
- Symptoms typically appear about three weeks after the impetigo symptoms start
- Protein in the urine and high blood pressure are common
- Gross hematuria — smoky, tea-colored, or cola-colored urine — is the most common presenting symptom, occurring in roughly 30–50% of cases
- Swelling of the abdomen, face, eyes, feet, and ankles can occur
About 5% of impetigo patients develop associated glomerulonephritis, and while most people recover within a few weeks without lasting problems, long-term kidney damage is possible in rare cases, and it’s more common in adults than children.
Quick takeaway: If urine color changes or unusual swelling shows up in the weeks after an impetigo infection — even one that’s already healed — that’s worth a same-week doctor visit, not a wait-and-see approach.
When to See a Doctor
Impetigo is usually manageable, but certain symptoms mean it’s time to stop self-treating and get it checked out:
- Sores that keep spreading despite keeping the area clean and covered
- Fever, chills, or swollen lymph nodes alongside the rash
- Sores that are deep, painful, or turning into ulcers (possible ecthyma)
- Large, spreading blisters, especially in an infant
- No improvement after a few days of over-the-counter antiseptic care
- A change in urine color or unusual swelling in the weeks following an infection
- Recurring impetigo, which can point to ongoing bacterial carriage in the nose that needs targeted treatment
A doctor can usually diagnose impetigo just by looking at the sores, and treatment is typically straightforward — topical antibiotics like mupirocin or fusidic acid, or oral antibiotics such as cephalexin for more widespread cases.
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FAQ Section
What are the first signs of impetigo?
The earliest sign is usually a small cluster of red, sometimes itchy sores or bumps, often near the nose or mouth. Within a day or two they rupture and start oozing, then dry into a honey-colored crust — that crust is the giveaway most people search for.
Is impetigo itchy or painful?
Mostly itchy, not painful, in the common non-bullous form. Bullous impetigo blisters can be somewhat painful, and ecthyma — the deep, ulcerating form — is genuinely painful rather than just itchy.
How long is impetigo contagious?
It’s contagious until the sores dry up completely, and generally for at least 24 hours after starting antibiotics. Left untreated, it can stay contagious for weeks since the bacteria survive on surfaces for a long time.
Can adults get impetigo?
Yes. It’s most common in young children, but adults — especially contact-sport athletes, people with eczema, or those in close-contact living situations — can get it too, and complications tend to be taken more seriously in adults.
What’s the difference between non-bullous and bullous impetigo?
Non-bullous impetigo forms small sores that crust over quickly in a golden color. Bullous impetigo forms larger, soft, fluid-filled blisters, mostly on the trunk, that take longer to rupture and are more likely to come with fever.
Can impetigo go away without antibiotics?
Sometimes, but slowly — untreated cases can take two to three weeks to clear and stay contagious longer. Antibiotics speed healing to about a week to ten days and lower the (already small) risk of complications.
What does it mean if urine turns dark after impetigo?
It can be an early sign of post-streptococcal glomerulonephritis, a rare kidney complication that can appear one to three weeks after a skin infection clears. Dark, tea- or cola-colored urine plus swelling warrants prompt medical attention.
How can you tell impetigo apart from ringworm or a cold sore?
Ringworm forms a scaly ring with a clear center and doesn’t ooze the way impetigo does. Cold sores cluster right at the lip line and crust drier and darker. Impetigo’s oozing, honey-colored crust and tendency to spread to new spots through scratching are its most distinct features.
