Cold sores heal on their own in about a week, but several over-the-counter creams, prescription antivirals, patches, and natural options can shorten that timeline and reduce pain. What you put on a cold sore matters most in the first 24 hours, when the tingling or burning sensation first appears. Starting treatment early gives you the best chance of limiting the outbreak’s severity.
Over-the-Counter Antiviral Cream
The most widely available OTC option is docosanol 10% cream, sold under the brand name Abreva. Unlike prescription antivirals that target viral DNA, docosanol works by blocking the virus from fusing with your skin cells in the first place, which prevents it from entering and replicating. In a clinical trial of over 700 patients, docosanol reduced median healing time by about 18 hours compared to a placebo. That’s modest, but it’s the only FDA-approved nonprescription antiviral for cold sores.
You’ll need to apply it five times a day at the first sign of tingling. Keep applying until the sore heals completely. Wash your hands before and after every application, and dab the cream on gently rather than rubbing it in. Rubbing can spread the virus to surrounding skin.
Prescription Antiviral Creams
Two prescription-strength topical antivirals are available: acyclovir 5% cream and penciclovir 1% cream. Both require application four to eight times daily, typically for four to ten days. Clinical reviews show these creams shorten pain and healing time compared to doing nothing, though the benefit is still relatively small, usually less than a full day faster. Their real value is in reducing discomfort during the outbreak and potentially limiting the sore’s size if you catch it early.
These creams are safe with no serious side effects, so they’re worth using if you have them on hand. The key limitation of all topical antivirals is that they only work on the surface. For more aggressive treatment, oral antivirals are a better option.
Oral Antiviral Medications
If you get frequent or severe cold sores, a prescription oral antiviral is the most effective treatment available. Valacyclovir can be taken as a one-day course: two high-dose tablets about 12 hours apart, started at the first sign of an outbreak. Other oral options include acyclovir and famciclovir, taken over several days.
Without any treatment, a recurring cold sore typically takes about a week to heal. Oral antivirals can cut that noticeably shorter and reduce the severity of blistering and pain. Your first-ever cold sore outbreak tends to be the worst and can take up to three weeks to resolve, which is when oral medication makes the biggest difference.
Pain-Relieving Topicals
If the sore is already painful and you want relief right now, numbing agents can help. Products containing lidocaine (typically around 4%) temporarily dull the nerve endings around the sore. Benzocaine-based products work similarly. These won’t speed healing, but they make eating, drinking, and talking less miserable.
Apply pain-relieving gels only to the sore itself and the skin immediately around it. Avoid getting them inside your mouth. Don’t layer these under cosmetics, lip balm, or sunscreen, as mixing products on an active sore can irritate it or interfere with healing.
Cold Sore Patches
Hydrocolloid patches (like Compeed) are thin, adhesive bandages designed specifically for cold sores. They absorb wound fluid, keep the area moist to promote healing, and create a physical barrier that blocks dirt and bacteria from entering the sore. A randomized clinical study found these patches performed comparably to acyclovir 5% cream for healing outcomes.
Patches also offer a cosmetic benefit: they’re discreet enough to wear under makeup, which helps if you’re self-conscious about a visible sore. One thing they can’t do is fully prevent transmission, since the herpes virus is also present in saliva. Still, the barrier reduces the chance of accidentally spreading the virus to other parts of your face through touch.
Lemon Balm
Among natural remedies, lemon balm (Melissa officinalis) has the strongest clinical support. In a study of 116 people with herpes simplex infections, lemon balm cream applied several times daily significantly reduced pain and swelling after just two days. Some participants reported relief within four hours. Lemon balm has documented antiviral properties and is available as a lip balm or cream at most health food stores.
L-lysine supplements are another popular recommendation you’ll see online. The idea is that this amino acid interferes with viral replication. However, clinical reviews remain inconclusive about whether lysine actually prevents or shortens outbreaks. It’s unlikely to cause harm, but don’t rely on it as your primary treatment.
How to Apply Anything to a Cold Sore
Whatever you put on a cold sore, hygiene matters as much as the product itself. Always wash your hands with soap and water before and after touching the area. Use a clean fingertip or a cotton swab for each application. Dab the product on gently. Don’t rub it in, because friction can push the virus into surrounding healthy skin, a process called autoinoculation.
Avoid applying cosmetics, sunscreen, or lip balm on top of medicated cream. If you’ve just applied a topical treatment, wait at least 30 minutes before washing your face or showering. And resist the urge to pick at or pop blisters. The fluid inside is highly contagious, and breaking the blister open slows healing and increases the risk of spreading the virus to your fingers or eyes.
When a Cold Sore Needs Urgent Attention
Most cold sores are annoying but harmless. The exception is when the virus spreads to your eyes, a condition called ocular herpes. Symptoms include eye redness, irritation, watery eyes, swollen eyelids, light sensitivity, and in more serious cases, blurred or worsened vision. If you develop blisters or sores near your eyes or notice any changes in your vision during an outbreak, get medical attention quickly. Untreated eye herpes can damage the cornea.