Impetigo vs Eczema vs Cold Sores: Key Differences & How to Tell Them Apart

Skin conditions around the face, lips or hands can often look similar, especially in the early stages. Impetigo, eczema and cold sores are commonly confused, but they have very different causes, symptoms and treatments.

This guide breaks down impetigo vs eczema vs cold sore clearly, so you can recognise the signs and know what to do next.

Quick Comparison Guide: Impetigo vs Eczema vs Cold Sore

Feature	Impetigo	Eczema	Cold sore
Type	Bacterial skin infection	Chronic inflammatory skin condition	Viral infection (HSV-1)
Is it contagious?	Yes (highly)	No	Yes (during outbreak)
Common areas	Around nose & mouth, hands	Hands, face, inner elbows, behind knees	Lips and around the mouth
Appearance	Red sores that turn into honey-coloured crusts	Dry, red, flaky or cracked patches	Clusters of small blisters filled with fluid
Main symptoms	Red sores, crusting, mild pain or discomfort	Intense itching, dry skin, redness or cracking	Tingling/burning sensation, blisters, pain
How it develops	Starts as sores → blisters → yellow crusts → spreads quickly	Gradual flare-ups → dry/itchy skin → may crack or weep	Tingling → blisters → bursting → scabbing
Cause	Bacteria entering broken skin	Skin barrier dysfunction + triggers	Herpes simplex virus
Treatment	Antibiotics (topical/oral)	Emollients, steroid creams	Antiviral creams/tablets

What Is Impetigo, What Is Eczema, and What Is a Cold Sore?

Condition	What it is
Impetigo	A contagious bacterial skin infection that causes red sores and crusting, often around the mouth or nose
Eczema	A non-contagious, inflammatory skin condition that causes dryness, irritation and inflammation due to a weakened skin barrier
Cold sore	A viral infection caused by the herpes simplex virus (HSV-1), leading to small blisters, most commonly around the lips and face

Impetigo vs Eczema vs Cold Sore: Symptoms

Symptom	Impetigo	Eczema	Cold sore
Redness	✅	✅	✅
Crusting	Honey-coloured	Rare (unless infected)	Scabbing after blisters burst
Blisters	Sometimes (bullous type)	Rare	Common
Itching	Mild–moderate	Intense	Mild (early), then pain
Pain	Mild	Rare	Common
Fluid/weeping	Yellow fluid that dries into crusts	Clear fluid leaking from irritated skin (weeping eczema)	Fluid-filled blisters that burst and then scab
Spread	Rapid, especially with contact	Localised or chronic	Localised but contagious

Impetigo vs Eczema vs Cold Sore: Causes

Cause	Impetigo	Eczema	Cold sore
Bacteria	✅(Staph/Strep)	❌	❌
Virus	❌	❌	✅(HSV-1)
Skin damage	✅(Key trigger)	✅(Contributing factor)	✅(Can trigger outbreak)
Immune response	❌	✅	✅
Triggers	Cuts, insect bites, scratching	Allergens, irritants, stress	Stress, illness, sunlight

Pharmacist explains: Impetigo often develops after skin damage such as cuts or insect bites. If a bite becomes infected, you can get professional support and advice through Weldricks’ insect bite treatment service.

Impetigo vs Eczema vs Cold Sore: Treatment Options

Treatment	Impetigo	Eczema	Cold sore
Antibiotic creams	✅(Main treatment)	❌	❌
Oral antibiotics	✅(If severe)	❌	❌
Moisturisers (emollients)	Supportive	✅(Essential)	❌
Steroid creams	❌	✅	❌
Antiviral creams	❌	❌	✅
Hygiene measures	✅(Crucial)	Helpful	✅(Important)

Pharmacist explains: If you’re managing eczema, using the right skincare products is essential. You can explore suitable options in this guide on eczema creams and moisturisers or simply browse all our eczema treatment options.

How to Tell the Difference in Real Life: What Happens Step by Step

At first glance, impetigo, eczema and cold sores can look similar. However, the way they develop over time is often the easiest way to tell them apart:

Impetigo

1. Starts as small red spots or sores.
2. Quickly develops into blisters or open patches.
3. Forms honey-coloured crusts as it dries.
4. Can spread to nearby skin areas quite fast.

Key clue: Rapid spread + yellow/golden crusting

Eczema

1. Starts as dry, itchy, irritated skin.
2. May become red, inflamed and flaky.
3. In some cases, skin may crack or leak clear fluid (weeping eczema).
4. Tends to come and go over time, rather than spreading rapidly.

Key clue: Long-term dryness + intense itching + flare-ups

 

Cold Sore

1. Begins with a tingling, itching or burning feeling.
2. Develops into small fluid-filled blisters.
3. Blisters burst, ooze and then form a scab.
4. Usually heals in the same spot (often on the lips).

Key clue: Tingling first → then blisters → then scab

Can These Conditions Be Related?

Yes, in some cases:

• Eczema can become infected and lead to impetigo.
• Scratching eczema increases the risk of bacterial infection.
• Cold sores can appear alongside irritated skin.

If you're unsure, it’s important to get the right assessment early.

When Should You Seek Help?

You should consider professional advice if:

• The rash is spreading quickly.
• There is pain, swelling or fever.
• You’re unsure whether it’s impetigo or something else.
• Symptoms are not improving.

You can also learn more about transmission risks in our complete guide on impetigo.

Conditions That Can Be Confused With These

Some skin conditions can look very similar to impetigo, eczema or cold sores, especially in the early stages. Understanding these common lookalikes can help you spot the key differences more easily:

Conditions That Can Look Like Impetigo

• Infected (weeping) eczema
• Ringworm (fungal infection)
• Perioral dermatitis
• Impetigo-like insect bites (especially if scratched)

Conditions That Can Look Like Eczema

• Psoriasis
• Contact dermatitis
• Fungal infections
• Dry skin (xerosis)

Conditions That Can Look Like Cold Sores

• Impetigo on the lips
• Angular cheilitis
• Perioral dermatitis
• Allergic reactions

FAQs

1. Can eczema become impetigo?

Yes. If eczema skin becomes damaged or infected with bacteria, it can develop into impetigo.

2. Is there a test to confirm impetigo?

In most cases, a pharmacist or clinician can diagnose it visually. Lab tests are rarely needed.

3. Can impetigo creams work on a cold sore?

No. Impetigo is bacterial and requires antibiotics, while cold sores are viral and need antiviral treatment.

Differences Between Impetigo, Eczema and Cold Sores — Summary

Although impetigo, eczema and cold sores can look similar, understanding their key differences can help you act quickly and choose the right treatment. Paying attention to symptoms, patterns and triggers can make identification much easier.

If you suspect impetigo or need expert advice, you can access support through Weldricks’ impetigo treatment service for fast, professional guidance.