The fastest way to get rid of a sore on your lip depends on what type of sore it is. Most lip sores are either cold sores (fluid-filled blisters on the outside of the lip), canker sores (round white or yellow ulcers inside the mouth), or cracked corners caused by a condition called angular cheilitis. Each has a different cause and responds to different treatments, so identifying yours is the first step toward healing it.
Identify What Kind of Lip Sore You Have
The simplest way to tell the difference is by location and appearance. Cold sores show up on the outside of the mouth, usually right along the border of the lips. They look like a cluster of small, fluid-filled blisters and are caused by herpes simplex virus type 1 (HSV-1). You may feel a tingling or burning sensation a day or two before the blisters appear.
Canker sores form inside the mouth, on the inner lip, cheek, or gums. They’re typically a single round sore with a white or yellow center and a red border. Their exact cause isn’t fully understood, but they can be triggered by stress, mouth injuries (like biting your lip), smoking, or deficiencies in iron, folic acid, or vitamin B12. Canker sores are not contagious.
If the sore sits right in the corner of your mouth where the upper and lower lips meet, it’s likely angular cheilitis. This usually looks like cracked, red, sometimes crusty skin at one or both corners. Nutritional deficiencies account for about 25% of angular cheilitis cases, particularly low iron and B vitamins (B2, B3, B6, and B12). Fungal or bacterial infections cause most of the rest.
Treating a Cold Sore
Cold sores follow a predictable cycle: tingling, blistering, weeping (when the blister breaks open), crusting, and healing. The entire process typically runs 7 to 10 days without treatment. Starting treatment during the tingling stage, before blisters form, gives you the best chance of shortening that timeline.
The main over-the-counter option is a cream containing docosanol 10%, sold under the brand name Abreva. Applied five times a day, it shortens healing time by roughly 18 hours on average compared to doing nothing, bringing the median healing time from about 4.8 days down to 4.1 days. That’s a modest improvement, but it’s most effective when you start at the first tingle. Continue applying until the sore heals, up to 10 days maximum.
For a more significant effect, a prescription antiviral can help. The most commonly prescribed option is a one-day oral treatment: two high-dose pills taken 12 hours apart. This works best when started within the first 24 hours of symptoms. If you get cold sores frequently, your doctor can write a prescription in advance so you have medication ready the next time you feel that familiar tingle.
Home Remedies That Have Evidence
Honey applied directly to a cold sore performs surprisingly well. A meta-analysis of clinical trials found that honey produced complete healing of herpes sores in about 8 days on average, compared to roughly 9 days for prescription antiviral cream. Honey also reduced pain at a rate comparable to antiviral treatment. Propolis, the resin-like substance bees use to seal their hives, performed even better than antiviral cream for healing in the same analysis. Medical-grade or raw honey applied several times daily is a reasonable option if you prefer to avoid medication.
For pain relief while you wait for healing, look for OTC lip products containing benzocaine or lidocaine, which temporarily numb the area. Ice wrapped in a cloth and held against the sore for a few minutes can also dull the pain and reduce swelling.
Treating a Canker Sore
Most canker sores heal on their own within one to two weeks. The goal of treatment is managing pain so you can eat and drink comfortably. Over-the-counter numbing gels containing benzocaine work well for this. Apply a small amount directly to the sore before meals.
Rinsing with warm salt water (about half a teaspoon of salt in a cup of warm water) several times a day can help keep the area clean and reduce irritation. Some people find that a rinse of equal parts hydrogen peroxide and water, applied with a cotton swab, speeds healing. Avoid spicy, acidic, or rough-textured foods that scrape against the sore.
If you get canker sores repeatedly, it’s worth checking whether you’re low in iron, B12, or folic acid, since deficiencies in these nutrients are a known trigger. A simple blood test can confirm this.
Treating Angular Cheilitis
Cracked corners of the mouth won’t heal with cold sore cream or canker sore remedies because the cause is usually different. If a fungal infection is involved (common in people who drool during sleep or wear dentures), an over-the-counter antifungal cream designed for skin use can clear it up within a week or two. Keeping the corners of your mouth dry and applying a barrier like petroleum jelly helps prevent moisture from collecting in the creases.
When a nutritional deficiency is the root cause, treating the deficiency resolves the sore. In one documented case, iron supplementation taken twice daily cleared angular cheilitis that hadn’t responded to other treatments. If your corners crack repeatedly without an obvious cause, ask your doctor to check your iron and B vitamin levels.
Preventing Future Outbreaks
Cold sores tend to recur because the virus stays dormant in your body after the first infection. Common triggers for reactivation include sun exposure, stress, illness, fatigue, and hormonal changes. Wearing lip balm with SPF 30 or higher is one of the simplest preventive steps you can take.
The amino acid L-lysine, available as a supplement, has some evidence for reducing cold sore frequency. Research suggests that 1,000 milligrams daily helps prevent outbreaks. One study found that taking 1,000 mg three times daily for six months decreased both the number of infections and healing time. Lysine is generally well tolerated, though it’s a supplement rather than a proven pharmaceutical.
For canker sores, prevention comes down to identifying your personal triggers. Switching to a toothpaste free of sodium lauryl sulfate (a foaming agent that irritates mouth tissue in some people), managing stress, and correcting any nutritional gaps are the most effective long-term strategies.
Signs a Lip Sore Needs Medical Attention
Most lip sores are harmless and heal within two weeks. A sore that lasts longer than two weeks without improving should be evaluated by a healthcare provider. This is the key timeline to watch. The most common sign of lip cancer is a sore, blister, or lump on the lower lip that simply won’t go away. Other warning signs include a flat or slightly raised discolored patch on the lip, numbness or tingling that doesn’t resolve, unexplained bleeding, or thickening of the lip tissue. A provider can perform a small tissue biopsy to rule out anything serious.
You should also seek care if a cold sore spreads to your eyes (which can damage your cornea), if you develop a high fever alongside the sore, or if you have a weakened immune system and the sore is growing rather than healing.