The most effective thing you can put on a cold sore is an antiviral cream, applied as early as possible. Docosanol 10% cream (sold as Abreva) is the only FDA-approved over-the-counter option, and it can shorten healing time by about 18 hours when applied five times daily. Prescription creams work faster, and several home remedies can ease symptoms while you heal.
Over-the-Counter Antiviral Cream
Docosanol 10% cream is your best bet at the drugstore. It works by blocking the virus from entering healthy skin cells, which slows the outbreak from spreading. In a large clinical trial of 737 patients, those who used docosanol healed in a median of 4.1 days, compared to 4.8 days for placebo. That’s not a dramatic difference, but it’s most effective when you start applying it at the very first tingle or itch, before blisters form. You apply it five times a day until the sore heals completely.
Prescription Antiviral Creams
If you get cold sores frequently, a prescription cream may be worth asking about. Penciclovir 1% cream significantly reduces overall healing time, pain, and symptoms like itching, burning, and swelling compared to no treatment. In head-to-head comparisons, penciclovir moved sores to the crusting stage faster than acyclovir 5% cream, though both had similar cure rates by day seven.
Acyclovir 5% cream shortens the duration of an episode and reduces pain, but studies found it didn’t significantly reduce the total number of days until the lesion fully healed compared to placebo. For that reason, penciclovir tends to be the stronger prescription topical. Both require application every two hours while you’re awake, which is more frequent than docosanol.
Numbing Products for Pain Relief
Cold sores can throb, burn, and sting, especially during the blister and open-wound stages. Over-the-counter products containing benzocaine (typically at 5% for lip-specific formulas) numb the area on contact. You can use these up to three times a day. They won’t speed healing, but they make eating, drinking, and talking less painful while the antiviral does its job.
Cold Sore Patches
Hydrocolloid patches designed for cold sores (like Compeed) cover the sore with a thin, nearly invisible bandage that creates a moist healing environment. A clinical study found these patches were comparable to acyclovir cream in healing time, with added benefits: they protect the wound from irritation, reduce cracking and scabbing, and make the sore less visible. They also create a physical barrier that lowers the chance of touching the sore and spreading the virus to other parts of your face or to other people.
You can apply most antiviral creams underneath a patch, getting both benefits at once. Replace the patch whenever it starts to peel.
Petroleum Jelly
The American Academy of Dermatology recommends keeping your lips moist during an outbreak. Petroleum jelly applied over the sore prevents the scab from cracking and bleeding, which reduces pain and lowers the risk of a secondary bacterial infection. It won’t fight the virus, but it’s a simple, inexpensive layer of protection that helps at every stage of healing. Dry, cracked lips also make you more prone to future outbreaks, so regular use between episodes is a good habit.
Medical-Grade Honey
Kanuka honey, a medical-grade honey from New Zealand, performed essentially the same as acyclovir cream in a randomized controlled trial published in BMJ Open. Both groups healed in 8 to 9 days, reached the open-wound stage at the same rate (2 days), and reported identical median times to pain resolution (9 days). If you prefer a natural option, medical-grade honey applied five times daily is a reasonable alternative to a prescription antiviral cream. Regular grocery store honey hasn’t been studied in the same way and may carry infection risks on open skin, so look for products specifically labeled as medical grade.
Lemon Balm Extract
Topical lemon balm (Melissa officinalis) extract has clinical support as a cold sore remedy. In a controlled trial, patients who applied lemon balm cream had significantly lower symptom scores by day two of treatment, with reductions in swelling, redness, and blistering compared to placebo. The cream also shortened the overall healing period and helped prevent the infection from spreading to surrounding skin. Lemon balm lip balms and creams are widely available at health food stores.
Peppermint Oil
Lab research shows peppermint oil has a direct antiviral effect on the herpes simplex virus. At very low concentrations, it reduced viral activity by 82% for HSV-1 (the type that causes most cold sores). The oil works by disrupting the virus before it can enter skin cells, so it’s most useful at the earliest sign of an outbreak. Always dilute peppermint oil before applying it to your lip. Mix one or two drops into a teaspoon of a carrier oil like coconut or jojoba oil. Undiluted essential oil can burn or irritate already-inflamed skin.
What to Apply and When
Timing matters more than almost anything else. Cold sores progress through predictable stages: tingling, blistering, open wound, crusting, and healing. The earlier you apply an antiviral, the less severe the outbreak will be. Here’s a practical approach based on where you are in the process:
- At the first tingle: Apply docosanol or a prescription antiviral immediately. This is when treatment has the biggest impact.
- During blistering: Continue your antiviral cream. Add a hydrocolloid patch to protect the area and reduce visibility.
- At the open-wound stage: Keep applying antiviral cream. Use benzocaine for pain. Avoid picking or touching the sore.
- During scabbing: Layer petroleum jelly over the scab to prevent cracking and bleeding. A patch also works well here.
You can combine several of these treatments. An antiviral cream as your base, petroleum jelly or a patch for protection, and a numbing product for pain is a solid three-layer approach. Ice wrapped in a cloth and held against the sore for a few minutes can also reduce swelling in the early stages, though it won’t affect healing time.