Is It Impetigo? Why Your Skin Is Blistering + Medical Next Steps

If you've noticed blistering, crusting, or oozing skin, you may be wondering: Is this impetigo?

Impetigo is a common and highly contagious bacterial skin infection. It affects both children and adults, though it's most common in young children. The good news? In most cases, impetigo is treatable and clears without long-term problems when managed properly.

This guide will help you understand:

• What impetigo looks like
• Why your skin may be blistering
• When it's likely impetigo (and when it's not)
• Medical next steps
• When to speak to a doctor urgently

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What Is Impetigo?

Impetigo is a superficial bacterial infection of the skin. It's usually caused by:

• Staphylococcus aureus
• Streptococcus pyogenes

These bacteria enter through small breaks in the skin, such as:

• Scratches
• Insect bites
• Eczema patches
• Minor cuts
• Irritated skin

It spreads easily through skin-to-skin contact or shared items like towels, clothing, or sports equipment.

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What Does Impetigo Look Like?

There are two main types of impetigo, and they can look slightly different.

1. Non-Bullous Impetigo (Most Common)

This is the classic form and makes up about 70% of cases.

Common signs include:

• Red sores that quickly burst
• Oozing fluid
• Thick, honey-colored crusts
• Mild itching
• Usually appears around the:
  • Nose
  • Mouth
  • Chin
  • Arms or legs

It may start as a small red bump and spread outward.

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2. Bullous Impetigo (Blistering Type)

This form causes larger, fluid-filled blisters.

Signs include:

• Large, fragile blisters
• Clear or yellow fluid inside
• Blisters that rupture easily
• Thin brown crusts afterward
• Often appears on:
  • Trunk
  • Armpits
  • Groin
  • Diaper area in babies

Bullous impetigo is more common in infants and young children.

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Why Is Your Skin Blistering?

Blistering happens when bacteria release toxins that weaken the bonds between skin cells. In bullous impetigo, these toxins separate the upper layer of skin, forming fluid-filled blisters.

However, not all blistering skin is impetigo.

Other possible causes include:

• Contact dermatitis (allergic reaction)
• Cold sores (herpes simplex virus)
• Eczema flare-ups
• Shingles
• Fungal infections
• Insect bites
• Autoimmune blistering disorders (rare but serious)

If blisters are widespread, painful, or accompanied by fever, it's important to seek medical care promptly.

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How Do You Know If It's Impetigo?

Impetigo is more likely if:

• The sores have honey-colored crusts
• The rash spreads quickly
• It started after a small cut, scrape, or bug bite
• Someone nearby has a similar rash
• It's mildly itchy but not severely painful
• There are no deep ulcers or scarring

Impetigo is usually diagnosed by appearance alone. Lab tests are rarely needed unless:

• The infection keeps coming back
• It doesn't respond to treatment
• There's concern for antibiotic resistance

If you're unsure whether your symptoms match, try Ubie's free AI-powered Impetigo symptom checker to get personalized insights in just 3 minutes.

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Is Impetigo Serious?

In most healthy people, impetigo is not dangerous when treated properly.

However, without treatment, complications can occur.

Possible Complications

• Spread to deeper skin layers (cellulitis)
• Swelling of nearby lymph nodes
• Scarring (rare)
• Kidney inflammation (very rare, usually after streptococcal infection)

Signs of a more serious infection include:

• Fever
• Increasing redness and swelling
• Severe pain
• Red streaks spreading from the area
• Fatigue
• Rapid worsening

If any of these occur, seek medical care immediately.

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How Is Impetigo Treated?

Treatment depends on how widespread the infection is.

1. Mild Cases (Small Areas)

Doctors typically prescribe:

• Topical antibiotic ointment (such as mupirocin or retapamulin)
• Applied directly to the sores for 5–7 days

Before applying medication:

• Gently wash the area with soap and water
• Remove crusts carefully
• Pat dry with a clean towel

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2. More Widespread or Severe Cases

Oral antibiotics may be needed if:

• There are many lesions
• The infection is spreading quickly
• Topical treatment fails
• The person is immunocompromised

It's important to complete the full course of antibiotics, even if the skin looks better.

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How Long Does Impetigo Last?

• Without treatment: 2–4 weeks
• With treatment: Improvement within 3–5 days
• No longer contagious: Usually 24 hours after starting antibiotics

Children are generally advised to stay home from school or daycare until they've been on antibiotics for at least 24 hours.

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How to Prevent Spread

Because impetigo is highly contagious, prevention matters.

At Home:

• Wash hands frequently
• Keep fingernails short
• Avoid scratching
• Cover sores loosely with gauze
• Do not share towels, clothing, or bedding
• Wash contaminated items in hot water

For Children:

• Keep them home from school until cleared
• Clean toys and surfaces regularly

Good hygiene reduces reinfection and protects others.

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When Should You See a Doctor?

You should speak to a healthcare professional if:

• You suspect impetigo and it's spreading
• Blisters are large or numerous
• There is fever
• The skin is very painful
• You have diabetes or a weakened immune system
• The infection does not improve within 3–5 days of treatment
• The rash keeps coming back

While impetigo is usually manageable, untreated bacterial infections can occasionally become serious. If symptoms feel severe, rapidly worsen, or involve the face and eyes, seek medical care urgently.

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Special Considerations for Adults

Although more common in children, adults can develop impetigo—especially if they:

• Play contact sports
• Have skin conditions like eczema
• Work in close-contact environments
• Have weakened immune systems

In adults, impetigo may be mistaken for:

• Shaving irritation
• Fungal infection
• Herpes
• Contact dermatitis

A proper medical evaluation can help clarify the cause.

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Key Takeaways

• Impetigo is a common bacterial skin infection.
• It often causes blisters or honey-colored crusted sores.
• It spreads easily but is usually treatable.
• Early treatment reduces spread and complications.
• Severe pain, fever, or rapid worsening requires urgent care.

If you're concerned about your symptoms and want clarity before scheduling an appointment, use Ubie's free Impetigo symptom checker to understand what might be causing your blistering and receive guidance on next steps.

Most importantly, if anything about your symptoms feels serious, unusual, or life-threatening, speak to a doctor immediately. Skin infections are often simple to treat—but delaying care can make them harder to manage.

When in doubt, getting professional medical advice is always the safest next step.