Most lip sores heal on their own within one to two weeks, but the right treatment depends on what type of sore you’re dealing with. The three most common kinds are cold sores (fluid-filled blisters on the outside of your lips), canker sores (round ulcers inside your mouth), and angular cheilitis (cracked, raw skin at the corners of your mouth). Each has a different cause and responds to different care.
Figure Out Which Type You Have
The fastest way to tell is by location. Cold sores appear on the outside of your mouth, typically right along the border of your lips. They start as a cluster of small, fluid-filled blisters and are caused by the herpes simplex virus (usually type 1). They’re contagious.
Canker sores show up inside your mouth, on the inner cheeks, inner lips, or tongue. They look like a single round white or yellow sore with a red border. They’re not contagious and don’t have a single known cause, though stress, mouth injuries, smoking, and deficiencies in folic acid, iron, or vitamin B12 can trigger them.
Angular cheilitis is different from both. It causes red, cracked, sometimes oozing skin specifically at the corners of your mouth. It’s usually caused by a fungal or bacterial infection that thrives in moisture, and low levels of B vitamins, iron, or protein raise your risk.
Healing Cold Sores
Cold sores follow a predictable timeline. On day one, you’ll feel tingling, itching, or numbness on your lip. Within 24 hours, bumps form and fill with fluid. By days two to three, the blisters rupture and weep clear fluid. A golden-brown scab forms around days three to four, and the scab typically falls off within six to 14 days from the start of the outbreak.
The most effective thing you can do is start treatment at the first tingle, before blisters appear. Over-the-counter cream containing docosanol (sold as Abreva) works by blocking the virus from entering healthy skin cells. Prescription antiviral creams work differently: they interfere with the virus’s ability to copy its own DNA, which stops it from multiplying. Both approaches shorten healing time modestly, but neither eliminates the virus entirely since it lives dormant in your nerve cells between outbreaks.
For pain, look for an OTC lip product containing benzocaine (typically at 20% concentration) or lidocaine (typically at 5%). These numb the area on contact. Keeping the sore moisturized with petroleum jelly also prevents the scab from cracking painfully. Avoid picking at the scab, and wash your hands after touching the sore to prevent spreading the virus to your eyes or to other people.
Medical-Grade Honey as an Alternative
A randomized controlled trial published in BMJ Open compared medical-grade kanuka honey to a standard antiviral cream for cold sores. The median healing time was nine days for honey and eight days for the antiviral, a difference that was not statistically significant. Both treatments performed equally across pain resolution and the proportion of outbreaks that were stopped early. If you prefer a natural option, medical-grade honey is a reasonable choice, though it won’t outperform an antiviral cream.
Healing Canker Sores
Most canker sores heal within one to two weeks without treatment. To speed things along and reduce pain, rinse your mouth with warm salt water several times a day (about half a teaspoon of salt in a cup of water). OTC oral gels with benzocaine can numb the sore before meals. Avoid acidic, spicy, or abrasive foods that irritate the ulcer.
One surprisingly effective change is switching your toothpaste. A systematic review found that people who used toothpaste free of sodium lauryl sulfate (SLS), a common foaming agent, had significantly fewer canker sores. Compared to SLS-containing toothpaste, the SLS-free versions reduced the number of ulcers by about one per cycle, shortened how long each ulcer lasted by nearly two days, and meaningfully reduced pain. If you get canker sores repeatedly, checking your toothpaste ingredients is one of the simplest things you can try. Brands marketed as “gentle” or “sensitive” often skip SLS.
Since canker sores are linked to nutritional gaps, recurring outbreaks are worth investigating. Make sure your diet includes enough iron (red meat, beans, spinach), vitamin B12 (eggs, dairy, fortified cereals), and folic acid (leafy greens, citrus). A blood test can confirm whether you’re actually deficient.
Healing Angular Cheilitis
The cracked corners of your mouth won’t heal if they stay wet. Saliva pooling at the corners creates the perfect environment for fungal and bacterial growth, which is why licking your lips makes it worse. Apply a thick layer of petroleum jelly or lip balm to create a moisture barrier.
If the cracks are red, swollen, or crusting, you likely need an antifungal cream to clear the underlying infection. Topical steroid creams can help reduce swelling and pain. For cases caused by bacteria rather than fungus, antibiotic ointment is the appropriate treatment. A doctor or dentist can determine which type of infection you’re dealing with.
Long-term, address the root cause. Eating more foods rich in protein, iron, and B vitamins can resolve cases driven by poor nutrition. Poorly fitting dentures or braces that create skin folds at the mouth corners are another common contributor. Angular cheilitis tends to come back until the underlying issue is fixed.
Preventing Future Outbreaks
For cold sores, the amino acid L-lysine is the most widely used supplement for prevention. The recommended daily dose for reducing outbreak frequency is 1,500 to 3,000 mg. Sun exposure is a well-known trigger for cold sore recurrences, so using a lip balm with SPF 30 or higher before going outside is a simple preventive step. Stress, illness, and fatigue also reactivate the virus, so outbreaks often cluster around the same life circumstances.
For canker sores, switching to an SLS-free toothpaste, managing stress, and correcting any vitamin deficiencies are the most evidence-backed strategies. If you notice your canker sores follow a pattern (after biting your cheek, after eating certain foods, during stressful weeks), tracking triggers helps you avoid them.
When a Lip Sore Needs Medical Attention
A sore that hasn’t improved after two weeks, or one that’s getting worse, warrants a visit to your doctor. Lip cancer lesions can look like cold sores, but cold sores eventually heal. The most common symptom of lip cancer is an ulcer or sore that simply won’t go away. White patches or unusually red patches on or around the lips are also worth getting checked. This is especially true if you have a history of heavy sun exposure or tobacco use. A two-week threshold is a reasonable point to seek evaluation, since both cold sores and canker sores should show clear improvement well before that mark.