Most cases of impetigo clear up within two to three weeks, and treatment with topical antibiotics can shorten that timeline to roughly seven to ten days. The speed of recovery depends on the type of impetigo, whether you treat it, and a handful of individual factors like skin health and bacterial resistance patterns in your area. Even without any treatment, the infection is self-limiting in otherwise healthy people, though leaving it alone carries risks that go beyond just waiting longer.
The Timeline With Treatment
When you see a doctor for impetigo, the standard first-line approach is a topical antibiotic applied directly to the sores, typically for about seven days. A systematic review and meta-analysis of impetigo treatments found that cure or meaningful improvement is usually assessed at seven to fourteen days from the start of treatment, and topical antibiotics are recommended for systemically well patients with limited disease.1PubMed Central. A systematic review and meta-analysis of treatments for impetigo In practice, most people notice the sores drying out and crusting over within the first few days of applying medication, with full clearance by the end of the first week or shortly after.
To put a finer point on it, a randomized placebo-controlled trial of retapamulin ointment found that about 86% of treated patients had clinical success after seven days, compared with roughly 52% of those given a placebo.2British Journal of Dermatology. Efficacy and safety of retapamulin ointment as treatment of impetigo: randomized double‐blind multicentre placebo‐controlled trial That placebo number is actually informative: it tells you that roughly half of cases will improve on their own within a week even without antibiotics. But treatment nearly doubles the proportion of people who are healed at that mark, and it also reduces the window during which you can spread the infection to others.
For more widespread impetigo or cases with fever and swollen lymph nodes, doctors may prescribe oral antibiotics instead of or in addition to a topical. Oral treatment follows a similar trajectory, with most people seeing improvement within a few days and clearance within seven to ten days, though the full course of antibiotics (usually seven to ten days) should be completed even if the skin looks better sooner.
The Timeline Without Treatment
Impetigo is technically self-limiting, meaning it will eventually resolve on its own in a person with a healthy immune system. Both the non-bullous and bullous forms usually clear within two to three weeks without scarring, and serious complications are rare.3PubMed Central. Impetigo: diagnosis and treatment But “self-limiting” and “quickly resolved” are not the same thing.
A systematic review looking specifically at the natural history of non-bullous impetigo without antibiotics found wide variation. At about seven days, the percentage of participants whose sores had resolved ranged from 13% to 74% across different studies, while the percentage classified as “failure to improve” ranged from 16% to 41%.4PubMed Central. Natural history of non-bullous impetigo: a systematic review of time to resolution or improvement without antibiotic treatment That enormous range reflects real differences in the populations studied, the bacteria involved, and how “resolved” was defined. The takeaway is that without treatment, about one in six to nearly half of people still have active, non-improving sores after a full week. Some of those people will be waiting two or even three weeks for the infection to run its course.
The practical problem with skipping treatment is not just the longer wait. Untreated sores remain contagious, can spread to other parts of your own body through scratching, and carry a small but real risk of complications. For most healthy adults and nearly all children, treatment is recommended because it speeds healing, limits contagion, and reduces the odds of the infection spreading deeper.
Non-Bullous Versus Bullous Impetigo
Impetigo comes in two main forms, and they look and behave somewhat differently. Non-bullous impetigo is by far the more common type, accounting for roughly 70% of cases. It starts as small red sores, usually around the nose or mouth, that quickly rupture and leave behind the characteristic honey-colored crusts. This form heals relatively quickly with treatment and is the type studied in most of the timeline research cited above.
Bullous impetigo is caused exclusively by strains of Staphylococcus aureus that produce exfoliative toxins. These toxins act as highly specific enzymes that cleave a single adhesion molecule called desmoglein 1 in the upper layers of the skin, causing the layers to separate and form fluid-filled blisters.5Nature Medicine. Toxin in bullous impetigo and staphylococcal scalded-skin syndrome targets desmoglein 1 The blisters are fragile and tend to pop easily, leaving behind larger raw patches than non-bullous impetigo produces.6PubMed Central. Staphylococcal Scalded Skin Syndrome and Bullous Impetigo Because the damage goes slightly deeper and the affected area is often larger, bullous impetigo can take a few extra days to fully heal, even with appropriate treatment. In practice, expect it to clear in about one to two weeks with antibiotics, and potentially up to three weeks without.
Which Bacteria Are Involved and Why It Matters for Healing
Impetigo is caused by two bacteria: Staphylococcus aureus and Streptococcus pyogenes, either alone or together.7F1000Research. A Novel Application of Pineapple Core Extract: In Vitro Antibacterial Activity against Staphylococcus aureus and Streptococcus pyogenes from Impetigo Lesions In many cases, particularly in children, both bacteria are present in the same sore. A study of impetigo sores in Indigenous Australian children found both organisms together in about 58% of lesions, with an additional 24% carrying S. pyogenes alone and 9% carrying S. aureus alone.8PubMed Central. The microbiology of impetigo in indigenous children: associations between Streptococcus pyogenes, Staphylococcus aureus, scabies, and nasal carriage
Which bacterium dominates your infection can subtly affect both the appearance and how quickly the right antibiotic works. Staphylococcal impetigo is more commonly associated with the bullous form and often responds well to anti-staphylococcal topical agents like mupirocin or fusidic acid. Streptococcal impetigo tends to cause the classic non-bullous, crusted form. The distinction matters most when treatment fails, since the first clue that you might be dealing with resistant bacteria is that the sores are not improving on schedule.
What Slows Healing Down
Several factors can stretch the healing timeline beyond the typical one-to-two-week window. Some are worth keeping in mind because they are modifiable.
Impetigo commonly develops as a secondary infection on already-damaged skin. Insect bites, eczema, cold sores, and minor cuts all create openings that bacteria exploit.9Journal of Pharmaceutical Research International. Overview on the Causes and Updated Management of Impetigo When the underlying skin condition is still active, the impetigo has a harder time clearing because the barrier keeps getting re-disrupted. If you have eczema underneath, for example, treating the eczema alongside the impetigo is important. Otherwise, the infection may seem to improve and then flare right back up.
More broadly, anything that impairs the skin’s barrier function increases both susceptibility and healing time. Trauma, poor nutrition, and systemic illnesses all play a role.10Medicine. Common cutaneous infections In young children, the constant cycle of touching sores and then touching healthy skin elsewhere is probably the single biggest driver of slow or relapsing disease. Keeping nails trimmed and sores covered with a light bandage helps break that cycle.
Antibiotic resistance is an increasingly relevant factor. In Belgium, surveillance data from 2013 to 2023 showed that resistance to mupirocin among S. aureus isolates rose from about 0.5–1.5% to roughly 1.7–5.6%. By 2023, between about 9% and 10% of impetigo isolates from children were co-resistant to both mupirocin and fusidic acid, the two most commonly prescribed topical antibiotics for the condition.11PubMed Central. Emergence and spread of a mupirocin-resistant variant of the European epidemic fusidic acid-resistant impetigo clone of Staphylococcus aureus, Belgium, 2013 to 2023 Resistance rates vary by country and region, but the trend is upward in many places. If your impetigo is not improving after a few days of topical treatment, it is worth going back to the doctor rather than waiting it out. A swap to a different antibiotic, or a switch from topical to oral medication, usually gets things back on track.
When You Can Go Back to School or Work
Impetigo is highly contagious through direct contact with the sores or with items that have touched them, like towels or clothing. Most guidelines consider a person non-contagious after 24 to 48 hours of effective antibiotic treatment, or once the sores have fully crusted over and are healing. Schools and daycares often require one of those two conditions before allowing a child to return.
If you are not using antibiotics, the contagious period lasts as long as the sores are weeping or crusted and active. That could be anywhere from one to three weeks. This is one of the strongest practical arguments for treating impetigo even when it would eventually go away on its own: treatment dramatically shortens the time you or your child needs to stay home.
To reduce spread within a household during the contagious period, avoid sharing towels, bedding, and razors. Wash your hands after touching the sores or applying medication. Cover active lesions with a loose bandage when practical, especially at daycare or school.
Why Impetigo Keeps Coming Back
Recurrence is one of the more frustrating aspects of impetigo, particularly in young children and in people with chronic skin conditions like eczema. One key driver is nasal carriage of S. aureus. Many people carry the bacteria in their nostrils without symptoms, and this reservoir can repeatedly re-seed the skin. A study of patients with recurrent skin infections found that nasal carriage of S. aureus was a significant independent risk factor for recurrence.12International Journal of Research in Dermatology. Nasal carriage and recurrent pyodermas
If impetigo keeps returning, your doctor may take a nasal swab to check for carriage. When S. aureus is found in the nose, a short course of mupirocin nasal ointment can help eliminate the reservoir and reduce recurrences. Some physicians also recommend antiseptic body washes during the decolonization period. The goal is not to sterilize your skin permanently, which is not possible and not desirable, but to knock back the bacterial load enough that the normal skin barrier can do its job.
Environmental factors also contribute to recurrence. In settings where crowding, humidity, and limited access to clean water are common, impetigo prevalence is strikingly high. A global systematic review found a median childhood prevalence of about 12%, but in underprivileged communities within high-income countries, the median prevalence reached about 19%.13PubMed Central. The Global Epidemiology of Impetigo: A Systematic Review of the Population Prevalence of Impetigo and Pyoderma These numbers reflect the reality that impetigo is not just about bacteria; it is about skin integrity, hygiene infrastructure, and close physical contact.
Possible Complications and When to See a Doctor Again
For the vast majority of people, impetigo heals completely without any lasting effects. It does not scar in most cases, because the infection stays in the superficial layers of the skin. But there are a few uncommon complications worth knowing about.
The most discussed is post-streptococcal glomerulonephritis, a kidney inflammation that can develop one to three weeks after a streptococcal skin infection. It is rare, and it is caused by a specific immune reaction to the strep bacteria, not by the skin damage itself. Symptoms include dark or cola-colored urine, puffiness around the eyes, and decreased urine output. Most cases, especially in children, resolve fully, but they do require medical attention. Treating impetigo with antibiotics does not clearly prevent this complication, since the immune reaction is already triggered before treatment begins, but treating the skin infection is still worthwhile for all the other reasons already discussed.
Cellulitis is another possible complication, where the infection moves from the skin’s surface into deeper tissue. Signs include increasing redness that spreads beyond the original sore, warmth, swelling, and pain. Cellulitis requires oral or sometimes intravenous antibiotics and should be treated promptly.
A reasonable rule of thumb for when to go back to the doctor is: if the sores are not noticeably improving after three to four days of antibiotic treatment, if new sores keep appearing, if you develop fever, or if the redness is spreading rather than shrinking. Any of those could signal resistant bacteria, a deeper infection, or a missed underlying skin condition that is keeping the cycle going.
Impetigo in Adults Versus Children
Impetigo is overwhelmingly a childhood disease. It peaks in children aged two to five, who have the perfect combination of immature skin barriers, frequent minor skin trauma from play, close physical contact in group settings, and a habit of touching everything. Adults do get impetigo, though, particularly in warm and humid climates, in crowded living conditions, or when an existing skin condition breaks down the barrier.
The healing timeline in adults is broadly similar to children, but adults are more likely to present with secondary impetigo on top of another condition like eczema, contact dermatitis, or even shingles.14PubMed. Secondarily infected wounds and dermatoses: a diagnosis and treatment guide In these cases, the impetigo may clear on schedule but keep recurring until the underlying condition is properly managed. Adults with diabetes or who are immunocompromised should be especially attentive to impetigo that does not respond to initial treatment, since they have a higher risk of deeper skin infections.
There is a common assumption that impetigo in adults is somehow more serious or harder to treat, but the evidence does not support that. The same antibiotics work, the same timelines apply, and the same low complication rate holds, as long as the underlying skin is addressed and the immune system is functioning normally.
Does Impetigo Leave Scars?
Almost never. Because impetigo stays in the very top layers of the skin, healing happens without permanent marks in the vast majority of cases. Both non-bullous and bullous forms typically resolve without scarring.3PubMed Central. Impetigo: diagnosis and treatment You may notice temporary discoloration at the site of a healed sore, either lighter or darker than the surrounding skin, but this fades over weeks to months.
The exceptions involve cases where the infection was picked at or scratched aggressively, driving bacteria deeper and causing more tissue damage than the infection alone would. In people with darker skin tones, post-inflammatory hyperpigmentation or hypopigmentation can linger for several months even after the infection itself is long gone. This is a cosmetic issue rather than a medical one, and it resolves on its own, though consistent sun protection on the affected area can help it fade faster.
Ecthyma, a deeper form of impetigo that penetrates through the outer layer of skin into the dermis, is the one variant that can leave scars. It presents as punched-out ulcers rather than the typical superficial crusts, and it requires more aggressive treatment with oral antibiotics. If your sores look like deepening craters rather than spreading surface crusts, that is a sign you need medical attention promptly.