Do you sometimes get a small blister on your lips or around your mouth that itches and hurts? After a few days, it bursts, oozes fluid, forms a crust, and heals. Many people have this experience. We call this a 'Cold Sore'. Some also call it a 'fever blister'. Let's talk about this in simple, precise terms today.
What exactly is a Cold Sore?
Simply put, a Cold Sore is a blister on the skin caused by a viral infection called Herpes Simplex Virus (HSV) . After this virus enters our body, it lies dormant, or "sleeping," inside our nerve cells. Cold Sores occur when this virus reactivates from time to time.
Most often, these blisters appear on your lips or the skin around your mouth. But sometimes they can appear on other parts of your face, like your nose, cheeks, or chin.
What does it feel like when you get a cold sore? (Symptoms)
When the HSV virus first enters your body (primary infection) , you may experience other symptoms in addition to these blisters. This is especially common in young children when they first develop the condition.
- Getting a high fever
- Sore throat
- Red and swollen throat
- Painful sores inside the mouth, on the gums, tongue, and palate
These symptoms can make it difficult to eat or even drink water. However, when the virus reactivates later and a cold sore appears, these major symptoms usually don't appear. Then all that's left is the blister.
Complications that may occur in young children
HSV infection is most common in young children between the ages of 1 and 5. If your child has difficulty drinking fluids due to mouth sores, you should be careful to check for dehydration . Also, if your child is a thumb sucker or touches sores in their mouth, the infection can spread to those fingers, causing a condition called herpetic whitlow .
The stages of a cold sore from developing to healing
A cold sore usually develops, cracks, dries out, and heals within a week or two. Let's look at the stages of this.
| Stage | What is happening and when |
|---|---|
| First stage (Prodromal Stage) | Day 1: The skin on or around the lip starts to feel numb, itchy, or sore. This is the first sign that a blister is coming. This means that the virus has reactivated in the nerve cells. |
| Second stage (Blister Formation) | Days 1-2: Within 24 hours, small bumps appear at the numb area. These develop into fluid-filled blisters within a few hours. The area becomes red, swollen, and painful. |
| Stage Three (Weeping Stage) | Days 2-3: The blisters rupture and begin to ooze a clear or light yellow fluid. This is when the risk of spreading the virus is highest . |
| Fourth Stage (Crusting Stage) | Days 3-4: The bleeding stops and a scab forms. This is a golden-brown color. This scab may sometimes crack and bleed. |
| Stage Five (Healing) | Up to 14 days: This scab will fall off between 6 and 14 days. The skin underneath will remain slightly pink for a few days and then heal completely. |
Why do these occur? What are the causes?
As we mentioned earlier, the main cause of this is infection with the herpes simplex virus (HSV). There are two types of this virus: HSV-1 and HSV-2. Most cold sores are caused by the HSV-1 virus. However, sometimes the HSV-2 virus can also cause this condition.
Even though the virus is dormant in the body, certain things can reactivate it. We call these 'triggers'.
- Developing another illness (fever, cold)
- Stress
- Good sun exposure
- An injury to the mouth or surrounding area
- Hormonal changes (e.g., menstruation, pregnancy)
If you know what these triggers are, you may be able to prevent them from occurring.
Very important: Are Cold Sores Contagious?
Simply put, yes. They are highly contagious. You can get this virus from close contact with someone who has a cold sore.
The main ways the virus can spread are through skin-to-skin contact and saliva. This means that if you are around someone who has a cold sore, you should avoid these things:
- Kissing that person.
- Using the same items as that person, such as spoons/forks, straws, water bottles/cups, and lip balm.
- Touching that person's blister with your hand.
- Engaging in sexual activity that involves touching the blister. (For example, if someone with a cold sore engages in oral sex, the other person may develop genital herpes.)
Cold sores are contagious from the time you first feel the tingling sensation until the scab has completely healed. However, the highest risk of transmission is during the first 24 hours after the blister appears and while the fluid is still oozing.
What are the treatments for this?
There are treatments to heal cold sores quickly and reduce pain.
- Topical anesthetics: These are gels that are applied to the blister. They numb the area and temporarily reduce pain. This makes it easier to eat and drink.
- Topical antiviral medications: These are creams that you apply to the blisters. Some (e.g. docosanol) you can get without a prescription. Others (e.g. penciclovir) require a prescription from a doctor.
- Oral antiviral medications: These are medications that you take by mouth. You will need a doctor's prescription for this. Your doctor may prescribe these medications if you have had this infection for the first time or if it is getting worse frequently.
Antiviral medications (creams or pills) are most effective if started within the first 48 hours of the blisters appearing. So it's best to start treatment as soon as you feel that tingling sensation.
Whenever you see a doctor
Although a cold sore usually heals on its own, in some cases it is essential to seek medical advice.
| See your doctor: | |
|---|---|
| - Is this the first time this has happened to you? | |
| - If you want to talk about treatment (it is best to start treatment as soon as possible). | |
| - If the blister does not show signs of healing after about 10 days. | |
| - If the blisters are very large or the pain is unbearable. | |
| - If you are not sure if you have a cold sore or something else. | |
| - If there are other symptoms such as swollen gums or sores inside the mouth. | |
| - If you have a medical condition such as atopic dermatitis or HIV (these people are at higher risk of complications). | |
| - If your immune system is weak. |
Special warning about newborn babies
This is very important! If a newborn is exposed to the HSV virus, it will not stop with a common cold sore. It can develop into a serious, life-threatening condition called Neonatal Herpes . If an adult with a cold sore kisses your baby or you see signs of a rash on your baby's skin, see a pediatrician immediately.
Cold Sore? Or Canker Sore? - Let's Know the Difference
Many people confuse the two. Let's look at the main differences between the two.
| Feature | Cold Sore | Canker Sore |
|---|---|---|
| Reason | HSV virus | It is not caused by a virus. It can be caused by a number of factors (stress, vitamin deficiencies, minor injuries). |
| Is it contagious? | Yes, it is very contagious. | No, it is not contagious. |
| Place of birth | Usually on the lips and skin around the mouth. | Always inside the mouth (inside the cheeks, under the tongue, gums). |
Take-Home Message
- Cold Sores are caused by the herpes simplex virus (HSV). Once infected, the virus remains in the body for life.
- These are very contagious. Avoid kissing and sharing utensils while you have a blister.
- These can recur due to things like stress, illness, and excessive sun exposure.
- Applying antiviral ointments at the first sign of a blister can help speed healing.
- If the blisters are severe, haven't healed in more than 10 days, or if you're developing them for the first time, see your doctor.
- Never allow someone with a cold sore to kiss a newborn baby for any reason. It is very dangerous.
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