The most effective thing you can put on a cold sore is an antiviral, and the sooner you apply it, the better. Over-the-counter docosanol cream (sold as Abreva) is the only FDA-approved nonprescription antiviral for cold sores, while prescription options can shorten an outbreak by about a day. Beyond antivirals, several topical treatments can ease pain and may support healing.
A typical cold sore outbreak lasts seven to ten days. Nothing makes one vanish overnight, but the right combination of treatments, started early, can cut that timeline and reduce pain significantly.
Why Timing Matters More Than the Product
Cold sores go through a predictable sequence: a tingling or burning sensation (the prodrome), then blistering, ulceration, crusting, and healing. Treatment works best when started within 24 hours of the first symptoms, ideally during that initial tingle before blisters appear. The CDC notes that episodic treatment is most effective when initiated within one day of lesion onset or during the prodrome. Once a sore has fully blistered and crusted, antivirals have less virus replication to interrupt, so the benefit shrinks. If you get cold sores regularly, keeping your treatment of choice on hand means you can act the moment you feel that familiar warning sensation.
Over-the-Counter Antiviral Cream
Docosanol 10% cream is applied five times a day until the sore heals. It works by blocking the virus from entering healthy skin cells, which slows the outbreak and shortens both healing time and symptom duration, including tingling, pain, itching, and burning. You can find it at any pharmacy without a prescription. Apply it with a clean finger or cotton swab, and wash your hands immediately afterward to avoid spreading the virus to other areas.
Prescription Antivirals
If over-the-counter cream isn’t enough, a doctor can prescribe an oral antiviral. Valacyclovir, one of the most commonly prescribed options, is taken as two doses 12 hours apart in a single day. In clinical trials, this regimen shortened the average cold sore episode by about one day compared to no treatment. That may sound modest, but when paired with early timing, it can mean the difference between a full blister outbreak and a sore that barely develops.
Prescription topical antivirals (like acyclovir cream) are also available and applied five times daily. For people who experience frequent outbreaks, six or more per year, doctors sometimes prescribe daily suppressive therapy to reduce how often cold sores return.
Pain Relief You Can Apply Directly
Cold sores can throb, burn, and sting, especially during the blister and ulcer stages. Over-the-counter products containing benzocaine (typically at 5% concentration) numb the area on contact. These are sold specifically for cold sores and are safe for surface use on intact or mildly broken skin. Avoid using numbing agents on deep wounds or heavily cracked sores.
A simple ice cube wrapped in a cloth and held against the sore for a few minutes can also dull pain and reduce swelling without any product at all.
Honey as a Topical Treatment
Medical-grade kanuka honey has been tested head-to-head against prescription acyclovir cream in a large randomized trial published in BMJ Open. The result: honey performed about the same. Median healing time was 9 days for honey versus 8 days for acyclovir, a difference that was not statistically significant. Pain levels and time to pain resolution were also comparable between the two groups.
This doesn’t mean honey is a miracle cure. It means it’s a reasonable option if you prefer something natural or can’t access antivirals quickly. Use medical-grade honey, not the jar from your pantry. Regular honey hasn’t been standardized or tested the same way and may contain bacteria that could complicate an open sore.
Zinc-Based Products
Topical zinc solutions have shown promise for cold sores. Zinc salt solutions applied to herpetic lesions appear to decrease viral load and improve healing rates while relieving symptoms as the sore heals. Zinc-based cold sore swabs are available over the counter. They’re not a replacement for antivirals, but they can be a useful addition, especially if you’re layering treatments.
Essential Oils: What the Lab Shows
Several essential oils, including ginger, thyme, hyssop, and sandalwood, have demonstrated antiviral activity against herpes simplex virus in laboratory studies. Research published in Antimicrobial Agents and Chemotherapy found that pretreating the virus with these oils reduced its ability to infect cells by 95% to 99%. The oils appear to work by disrupting the virus’s outer envelope before it can attach to skin cells.
There’s an important caveat. These results come from cell cultures, not human skin. The oils worked best against free-floating virus and had limited effect once the virus was already inside cells or spreading between them. The concentrations that were effective were extremely low (thousandths of a percent), and applying undiluted essential oils to a cold sore can cause chemical burns and irritation that actually slows healing. If you want to try them, dilute heavily in a carrier oil and treat them as a supplement to proven antivirals, not a substitute.
Lysine Supplements
L-lysine is an amino acid that competes with arginine, another amino acid the herpes virus needs to replicate. It’s taken orally rather than applied topically. For prevention, a common recommendation is 500 to 1,000 mg daily. During an active outbreak, some practitioners suggest increasing to up to 3,000 mg per day for the duration of the acute phase. Doses up to 3 grams daily are generally well tolerated, though higher amounts can cause nausea, abdominal cramps, and diarrhea.
The evidence for lysine is mixed. Some long-term follow-up studies report fewer and less severe recurrences, but large-scale clinical trials haven’t firmly established it as a treatment. It’s inexpensive, widely available, and low-risk, which is why many people with recurrent cold sores consider it worth trying alongside other approaches.
What Not to Put on a Cold Sore
Rubbing alcohol and hydrogen peroxide are common impulse treatments, but both dry out and damage healing tissue, which can extend your recovery time rather than shorten it. Toothpaste is another popular home remedy with no clinical support. Petroleum jelly won’t treat the virus, though a thin layer over a crusted sore can prevent painful cracking.
Picking at or peeling a cold sore crust is one of the worst things you can do. It exposes raw tissue, increases the risk of bacterial infection, and can spread the virus to surrounding skin or your fingers.
Signs a Cold Sore Needs Medical Attention
Most cold sores are annoying but harmless. A few situations call for professional care: sores that haven’t healed within two weeks, severe symptoms, frequent recurrences, or gritty and painful eyes (which can signal the virus has spread to the cornea, a condition that can affect vision). People with weakened immune systems, whether from medication, illness, or chemotherapy, should contact a doctor at the first sign of an outbreak, since the virus can spread more aggressively.
If you have eczema, be especially cautious. The herpes virus can spread rapidly across skin affected by eczema, a condition called eczema herpeticum, which is a medical emergency.