Noticed a blister or crusty sore forming around the mouth or nose? You may be wondering whether it’s a cold sore or impetigo—and more importantly, if it’s contagious. Both conditions are common, especially in children and young adults, and both can be passed from person to person. However, they have different causes, treatments, and levels of risk when it comes to spreading to others.
At Seaton Pharmacy, we often speak to patients who are unsure what they’re dealing with and how to prevent it from affecting their family, friends, or co-workers. In this blog, we’ll break down the key differences between impetigo and cold sores, how contagious they really are, and what steps you can take to reduce the risk of passing them on.
Impetigo vs Cold Sore: What’s the Difference?
Cold sores are caused by the herpes simplex virus (HSV-1) and usually appear as small blisters on or around the lips. They may start with a tingling or burning sensation, followed by the appearance of fluid-filled sores that scab over after a few days.
Impetigo, on the other hand, is a bacterial skin infection usually caused by Staphylococcus aureus or Streptococcus pyogenes. It begins with red sores or blisters that burst and form a golden, honey-coloured crust. Impetigo commonly affects the face, particularly around the mouth and nose, but it can appear anywhere on the body.
Because their early stages can look similar, people often mistake impetigo or cold sore blisters for one another. However, distinguishing them is key to managing symptoms correctly—and reducing the risk of transmission.
Is Impetigo Contagious?
Yes, impetigo is highly contagious, especially in its early stages before the sores have dried out or scabbed over. The infection spreads through direct skin-to-skin contact or by touching items such as towels, bedding, or clothing that have been in contact with the infected area.
Impetigo is particularly common among:
–> Young children (due to close contact in nurseries and schools)
–> Athletes (particularly in contact sports)
–> People with cuts, insect bites, or skin conditions like eczema
If you suspect impetigo, it’s important to avoid close contact with others until the sores have healed or you’ve had at least 48 hours of antibiotic treatment.
Are Cold Sores Contagious Too?
Yes—cold sores are also contagious, especially when the blister is open or weeping. The herpes virus spreads through direct contact with the affected area, or by sharing items such as cutlery, lip balm, or towels.
Unlike impetigo, cold sores are caused by a virus that stays in your body permanently, and flare-ups can occur when triggered by stress, illness, sunlight, or hormonal changes. While the initial infection is usually caught in childhood or adolescence, the virus can be passed on at any age.
The good news is that both impetigo and cold sores can be managed effectively—and there are ways to limit the risk of spreading them to others.
How to Reduce the Risk of Spreading Impetigo or Cold Sores
Here are some practical tips to prevent the spread of infection:
–> Wash your hands regularly, especially after touching the affected area
–> Avoid touching or picking at sores or crusts
–> Don’t share personal items such as towels, razors, lip products, or cutlery
–> Keep affected areas clean and loosely covered, if possible
–> For impetigo, stay off school or work until no longer contagious (usually 48 hours after starting antibiotics or when the sores have dried out completely)
–> For cold sores, avoid kissing or oral contact while the blister is present
–> Clean surfaces like door handles, toys, and shared electronics if used while the infection is active
When to See a Pharmacist
If you’re unsure whether you’re dealing with impetigo or a cold sore, your local pharmacy can help. At Seaton Pharmacy, we’re trained to assess skin conditions and offer guidance on the most appropriate treatment.
Through the Pharmacy First service, we can often provide antibiotic treatment for impetigo after a quick, confidential consultation—no need for a GP appointment. If it turns out to be a cold sore, we can recommend antiviral creams or patches that can help reduce symptoms and healing time.
The earlier you get the right diagnosis and treatment, the quicker you’ll recover—and the less chance there is of spreading it to others.
Speak to Seaton Pharmacy Today
If you’ve noticed a new sore, blister, or scab and aren’t sure whether it’s impetigo or a cold sore, don’t guess—speak to a pharmacist. At Seaton Pharmacy, we’re here to help you get the right care quickly and discreetly.
Contact us today for expert advice and same-day support, and let us help you feel better while protecting those around you.
This blog was written on behalf of Seaton Pharmacy by Pharmacy Mentor.