Cold sores are small, painful blisters that appear on or around the lips. While they're extremely common—affecting up to 90% of adults worldwide—they can be embarrassing and uncomfortable. The good news is that prescription antiviral medications can significantly speed healing and reduce the severity of outbreaks. UrgentDoc's English-speaking doctors can provide fast treatment, especially when you catch a cold sore early.
What Causes Cold Sores?
Cold sores are caused by the herpes simplex virus (HSV), usually type 1 (HSV-1). Key facts about cold sores:
- Most people are infected in childhood through non-sexual contact
- Once infected, the virus remains dormant in nerve cells for life
- Outbreaks occur when the virus reactivates
- Cold sores are contagious, especially when blisters are present
- Many people carry the virus but never have visible outbreaks
Important: Having cold sores is extremely common and nothing to be ashamed of. It's not a reflection of hygiene or lifestyle—most people acquire the virus in early childhood.
Stages of a Cold Sore
Understanding the stages helps you know when treatment is most effective:
Stage 1: Tingling (Day 1-2)
Itching, tingling, or burning sensation where the cold sore will appear. This is the best time to start treatment—antivirals are most effective at this stage.
Stage 2: Blistering (Day 2-4)
Small, fluid-filled blisters appear, usually in clusters. The area may be red and swollen. This is when cold sores are most contagious.
Stage 3: Weeping (Day 4-5)
Blisters burst and form shallow open sores that may merge together. Clear fluid oozes out—this fluid is highly contagious.
Stage 4: Crusting (Day 5-8)
A yellowish or brown crust forms over the sores. Avoid picking at the scab—this can cause scarring and delay healing.
Stage 5: Healing (Day 8-10+)
The scab falls off and the skin heals. Some pinkness may remain temporarily. Without treatment, healing typically takes 10-14 days.
Common Cold Sore Triggers
Outbreaks are often triggered by factors that weaken the immune system or stress the body:
- Sun exposure – UV radiation is a common trigger, especially on the lips
- Stress and fatigue – physical or emotional stress can trigger reactivation
- Illness or fever – hence the name "fever blisters"
- Hormonal changes – menstruation can trigger outbreaks in some women
- Cold weather or wind – dry, chapped lips are more vulnerable
- Weakened immune system – illness, medications, or other conditions
- Dental work or lip injuries – trauma to the mouth area
How Our Consultation Works
Book Quickly
Time matters with cold sores—book as soon as you feel the tingling. Describe your symptoms and take a photo if a sore is visible.
Quick Assessment
Our English-speaking doctor will confirm your cold sore, discuss your history of outbreaks, and determine the best treatment approach.
Fast Prescription
Receive a prescription for antiviral medication sent directly to your local pharmacy in Spain. Start treatment the same day.
Treatment Options
Prescription antivirals are the most effective treatment for cold sores:
Oral Antiviral Medications
- Valacyclovir (Valtrex) – highly effective, can be taken as a short 1-day course or longer treatment
- Acyclovir (Zovirax) – the original antiviral, taken multiple times daily for 5-10 days
- Famciclovir – another effective option with convenient dosing
Topical Treatments
- Acyclovir cream (prescription) – apply 5 times daily, modestly speeds healing
- Docosanol cream (over-the-counter) – can help if started very early
- Pain relief patches – hydrocolloid patches that protect and soothe
Pro tip: Oral antivirals work much better than creams. If you get frequent cold sores, consider asking about having a prescription ready to start at the first tingle.
Managing Cold Sores at Home
While waiting for treatment to work, these tips can help:
- Apply a cold compress to reduce swelling and discomfort
- Use lip balm with SPF to protect from sun and keep lips moisturized
- Take over-the-counter pain relief (paracetamol or ibuprofen) if needed
- Avoid acidic or salty foods that can irritate the sore
- Don't pick at or touch the cold sore
- Wash hands frequently to avoid spreading the virus
- Use a separate towel and avoid sharing utensils or drinks
- Avoid kissing or oral contact until completely healed
Preventing Future Outbreaks
If you experience frequent cold sores (6+ per year), you may benefit from:
- Daily suppressive therapy – low-dose daily antivirals to prevent outbreaks
- Sun protection – use SPF lip balm daily, especially in sunny Spain
- Stress management – regular sleep, exercise, and stress reduction
- Keeping a trigger diary – identify your personal triggers
- Maintaining lip health – keep lips moisturized, avoid licking them
- Boosting immune health – balanced diet, adequate sleep, limiting alcohol
When to Seek Immediate Care
Seek urgent medical care if you experience:
- Cold sore near your eyes or spreading to the eye area
- Severe outbreak with many sores or spreading beyond lips
- High fever with your outbreak
- Difficulty eating or drinking due to pain
- Cold sore that doesn't heal within 2 weeks
- Weakened immune system (HIV, chemotherapy, immunosuppressants)
- Signs of bacterial infection (increasing redness, pus, warmth)
Herpes near the eye can cause serious complications and requires immediate in-person evaluation.
Why Choose UrgentDoc for Cold Sore Treatment?
Fast Treatment
Same-day appointments—crucial for catching cold sores early
Speed Healing
Prescription antivirals can cut healing time nearly in half
English-Speaking Doctors
Discuss your symptoms and treatment without language barriers
Prescription Antivirals
Get effective prescription medication at any pharmacy in Spain
Feel a Cold Sore Coming On?
Don't wait—early treatment is key. Book a consultation now and get antiviral medication today.
Book a Consultation