Introduction
Impetigo is a common and highly contagious bacterial skin infection that usually affects children, although adults can develop it as well. It commonly appears around the nose and mouth but can occur on almost any area of the skin.
The infection often starts as small red spots, blisters, or sores that can break open and develop a characteristic yellowish or honey-colored crust. Because impetigo spreads easily through direct contact, recognizing it early and receiving appropriate treatment can help prevent transmission to family members and other close contacts.
Most cases can be treated successfully, but treatment depends on how extensive the infection is and whether there are complications.
What Is Impetigo?
Impetigo is a superficial infection of the skin caused by bacteria. The two bacteria most commonly associated with impetigo are Staphylococcus aureus and Streptococcus pyogenes.
It usually affects the outer layers of the skin rather than deeper tissues.
Impetigo is particularly common among young children because close contact, minor skin injuries, and shared toys or personal items can make transmission easier.
What Causes Impetigo?
Impetigo develops when certain bacteria enter or colonize the skin.
The bacteria can enter through:
- Scratches
- Insect bites
- Cuts
- Eczema-related damaged skin
- Small abrasions
- Other breaks in the skin
However, impetigo can also develop on apparently healthy skin.
Warm, humid conditions and close-contact environments can contribute to its spread.
Is Impetigo Contagious?
Yes. Impetigo is highly contagious.
It can spread through:
- Direct skin-to-skin contact
- Touching infected sores
- Shared towels
- Clothing
- Bedding
- Personal items
- Scratching and then touching another part of the body
Children can spread the infection quickly at schools, daycare centers, and during close play.
Avoiding contact with infected areas and maintaining good hygiene can reduce transmission.
What Does Impetigo Look Like?
Impetigo can have different appearances depending on the type.
Typical signs include:
- Small red sores
- Blisters
- Oozing lesions
- Yellow or honey-colored crusts
- Mild swelling
- Itching
- Irritation
The sores may start small and then spread to nearby areas.
Types of Impetigo
There are several clinical forms of impetigo.
Non-Bullous Impetigo
This is the most common form.
It often begins as small red spots or tiny blisters that rupture and form characteristic crusted sores.
The face, especially around the nose and mouth, is commonly affected, although lesions can appear elsewhere.
Bullous Impetigo
Bullous impetigo produces larger, fluid-filled blisters.
These blisters can rupture and leave moist areas of skin.
Bullous impetigo is more strongly associated with certain strains of Staphylococcus aureus that produce toxins affecting the superficial skin layers.
Ecthyma
Ecthyma is a deeper form of bacterial skin infection related to impetigo.
It produces deeper sores that can develop thicker crusts and may heal with scarring.
Because ecthyma involves deeper skin layers, medical treatment is particularly important.
Symptoms of Impetigo
Symptoms vary from person to person, but common signs include:
- Red skin
- Itchy sores
- Small blisters
- Fluid-filled lesions
- Crusting
- Oozing
- Mild tenderness
- Lesions that gradually spread
Some people have little discomfort, while others experience noticeable itching or irritation.
Impetigo on the Face
The face is one of the most common locations for impetigo.
Lesions may appear around:
- The nose
- Mouth
- Chin
- Cheeks
Because facial sores can spread through touching and scratching, keeping the affected area clean and avoiding picking is important.
Impetigo on the Body
Impetigo can occur on the arms, legs, trunk, hands, and other areas.
When lesions are present in several locations, healthcare professionals may consider whether the infection is spreading and whether treatment beyond a topical medication is appropriate.
Impetigo in Children
Children are particularly susceptible to impetigo.
Close physical contact, minor scratches, insect bites, and shared objects can all contribute to transmission.
Parents should discourage children from scratching or picking at lesions because this can spread bacteria to other areas of the body.
Children with extensive or rapidly spreading sores should be assessed by a healthcare professional.
Impetigo in Adults
Adults can also develop impetigo, particularly when the skin barrier is damaged.
Risk may increase with conditions such as eczema, frequent skin irritation, cuts, or close contact with an infected person.
Adults should also avoid sharing towels, razors, clothing, or other personal items during an active infection.
How Is Impetigo Diagnosed?
A healthcare professional can often diagnose impetigo by examining the skin.
The characteristic appearance of crusted or blistering lesions may be enough to identify the infection.
A bacterial culture may sometimes be performed, particularly when:
- The infection keeps returning
- Treatment does not work
- Antibiotic resistance is suspected
- The infection is extensive
- The diagnosis is uncertain
Impetigo Treatment
Treatment depends on the number of lesions, their location, severity, and the patient’s overall health.
Topical Antibiotics
For limited infections, a healthcare professional may prescribe a topical antibiotic.
The medication is applied directly to the affected skin according to the prescribed instructions.
Oral Antibiotics
Oral antibiotics may be recommended when the infection is more extensive, involves multiple areas, or cannot be appropriately treated with topical therapy alone.
The choice of antibiotic depends on the clinical situation and local resistance patterns.
Cleaning the Skin
Gentle cleansing can help remove crusts and reduce surface bacteria.
Do not aggressively scrub infected skin because this can cause additional irritation and damage.
Should You Pop Impetigo Blisters?
It is generally best not to pop or deliberately break impetigo blisters.
Breaking lesions can spread bacteria to surrounding skin and other people.
If a blister has already ruptured, gently clean the area and follow the treatment instructions provided by a healthcare professional.
How Long Does Impetigo Last?
With appropriate treatment, impetigo often begins improving within a few days.
The complete healing time varies depending on the extent of infection and the treatment used.
Without treatment, impetigo may continue to spread and remain contagious.
Following the prescribed treatment correctly is important even when the skin begins looking better.
When Is Impetigo No Longer Contagious?
The period of contagiousness decreases after effective treatment begins.
People should follow their healthcare professional’s advice regarding when it is appropriate to return to school, daycare, work, or close-contact activities.
Keeping sores covered when practical and maintaining good hygiene can further reduce transmission.
Impetigo and Eczema
People with eczema can be more vulnerable to bacterial skin infections because scratching and inflammation can weaken the skin barrier.
If eczema suddenly becomes more painful, develops oozing or crusting, or rapidly worsens, a bacterial infection such as impetigo may be present.
Treating both the infection and the underlying skin condition may be necessary.
Impetigo vs Cold Sores
Impetigo and cold sores can sometimes look similar, particularly around the mouth.
Cold sores are caused by the herpes simplex virus, while impetigo is a bacterial infection.
Cold sores often begin with tingling or burning followed by grouped blisters. Impetigo more commonly produces superficial sores and characteristic crusting.
A healthcare professional can help distinguish between them when the appearance is unclear.
Impetigo vs Ringworm
Ringworm is a fungal infection rather than a bacterial infection.
It often causes scaly, ring-shaped patches, whereas impetigo commonly causes crusted sores or blisters.
The treatments are different, so identifying the correct infection is important.
How to Prevent Impetigo
Good hygiene can reduce the risk of spreading impetigo.
Helpful measures include:
- Wash hands frequently.
- Keep infected areas clean.
- Avoid scratching or picking sores.
- Don’t share towels or clothing.
- Wash bedding and clothing regularly.
- Keep fingernails short.
- Clean cuts and scratches promptly.
- Avoid close contact with infected lesions.
People who have recurrent impetigo may need additional medical evaluation to determine why infections keep returning.
Can Impetigo Spread to Other Parts of the Body?
Yes.
Touching or scratching an infected lesion can transfer bacteria to another area of the skin.
This process, sometimes called autoinoculation, can result in additional sores.
Keeping the affected areas clean and avoiding touching them can help limit this spread.
Possible Complications
Most cases of impetigo resolve without major complications when appropriately treated.
However, complications can occasionally occur.
These may include:
- Cellulitis
- Deeper skin infection
- Ecthyma
- Scarring from deeper lesions
- Post-streptococcal glomerulonephritis
Kidney-related complications after streptococcal skin infections are uncommon but important.
When to See a Doctor
Medical evaluation is recommended when:
- Sores are rapidly spreading
- There are many lesions
- The infection affects a young infant
- There is significant pain or swelling
- Fever develops
- The skin becomes increasingly red or warm
- Treatment does not improve the infection
- The infection keeps coming back
- There are signs of a deeper skin infection
Prompt evaluation is particularly important when infection occurs near the eyes.
Impetigo and Hygiene
Good hygiene is an important part of managing impetigo.
Wash hands thoroughly after touching the affected area or applying medication.
Towels, washcloths, bedding, and clothing that come into contact with infected skin should be washed regularly.
Avoid sharing personal items until the infection has cleared.
Can You Prevent Impetigo Completely?
No prevention strategy eliminates the risk completely.
However, maintaining healthy skin, promptly caring for cuts and scratches, managing eczema, washing hands, and avoiding contact with infected lesions can substantially reduce the chance of transmission.
Conclusion
Impetigo is a common and highly contagious bacterial skin infection that can affect children and adults. It often appears as small sores, blisters, or characteristic honey-colored crusts, particularly around the nose and mouth.
The infection can spread through direct contact and contaminated personal items, making good hygiene and avoiding contact with infected lesions important. Limited infections may be treated with topical medication, while more extensive infections may require oral antibiotics.
Most cases improve with appropriate treatment, but rapidly spreading infection, fever, significant swelling, or symptoms suggesting a deeper infection require medical attention. Early recognition and proper treatment can help shorten the illness and reduce transmission.
10 Frequently Asked Questions About Impetigo
1. What is impetigo?
Impetigo is a contagious bacterial infection affecting the superficial layers of the skin. It commonly causes sores, blisters, and yellowish or honey-colored crusts.
2. Is impetigo contagious?
Yes. It can spread through direct skin contact and through contaminated towels, clothing, bedding, and other personal items.
3. What causes impetigo?
Impetigo is most commonly caused by Staphylococcus aureus or Streptococcus pyogenes bacteria.
4. Can adults get impetigo?
Yes. Although it is especially common in children, adults can develop impetigo, particularly when the skin barrier has been damaged.
5. How is impetigo treated?
Limited infections may be treated with a prescribed topical antibiotic, while more extensive infections may require an oral antibiotic.
6. Can I pop an impetigo blister?
It is generally better not to intentionally pop the blister because doing so can spread bacteria to other areas or other people.
7. How long does impetigo take to heal?
With appropriate treatment, improvement often begins within a few days, although complete healing can take longer depending on the severity of the infection.
8. Can impetigo leave scars?
Typical superficial impetigo usually heals without permanent scarring. Deeper infections such as ecthyma can potentially leave scars.
9. Can impetigo spread to other parts of the body?
Yes. Scratching or touching infected sores can transfer bacteria to nearby or distant areas of skin.
10. When should I see a doctor for impetigo?
See a healthcare professional if the infection is spreading quickly, involves many sores, causes fever or significant swelling, affects the area around the eyes, does not improve with treatment, or repeatedly returns.
