The fastest way to get rid of a lip sore depends on what kind you have. Most lip sores fall into three categories: cold sores (fluid-filled blisters on the outer lip), canker sores (white or yellow ulcers inside the mouth), and angular cheilitis (cracked, raw skin at the corners of the mouth). Each has a different cause and responds to different treatments, so identifying yours correctly is the first step toward healing it.
Identify Your Lip Sore
Cold sores appear as clusters of small, fluid-filled blisters on the outside of your mouth, typically right along the border of your lips. They’re caused by the herpes simplex virus, and you’ll often feel a tingling or burning sensation hours before the blisters show up. Sun exposure is a common trigger for outbreaks.
Canker sores look completely different. They’re round white or yellow sores with a red border that appear inside your mouth, on the inner cheeks, inner lips, or tongue. They’re not caused by a virus and aren’t contagious. Stress, mouth injuries (like biting your cheek), smoking, and deficiencies in folic acid, iron, or vitamin B12 can all trigger them. Allergic reactions occasionally set them off too.
Angular cheilitis shows up specifically at the corners of your mouth as painful cracks or fissures that get worse when you open your mouth wide. You might notice redness, oozing, or crusting. It’s usually caused by a fungal or bacterial infection that takes hold in moisture-trapped skin folds, and it typically affects both corners symmetrically. On darker skin tones, the affected area may look pale rather than red, sometimes with a darkened rim around it.
How to Treat a Cold Sore
Cold sores typically clear up on their own within 5 to 15 days, but you can significantly shorten that timeline if you act during the first few hours. The moment you feel that telltale tingle, itch, or burn, that’s your window. Prescription antiviral medication taken at this stage can cut an outbreak short. Once visible blisters, papules, or ulcers have already formed, antivirals are far less effective.
Over-the-counter options include topical creams containing the antiviral docosanol, which you can find at most pharmacies. Apply it at the first sign of tingling and continue using it several times a day. For pain, topical numbing gels containing benzocaine can take the edge off. Follow the directions on the product label and don’t use them longer than recommended.
One natural option with some clinical backing is propolis, a resin-like substance made by bees. In a controlled trial comparing a propolis ointment to a standard antiviral ointment, participants using propolis healed faster. By day 10, 24 out of 30 people in the propolis group had fully healed, compared to 14 out of 30 using the antiviral. Propolis also reduced local symptoms like pain and itching more quickly. You can find propolis-based lip balms and ointments at health food stores.
While your cold sore is active, wash your hands frequently and avoid touching the sore and then touching your eyes. The virus can spread from an open blister on your lip to your eyes through simple hand contact, causing eye herpes, which leads to irritation, redness, swelling, and blisters around the eye area.
Cold Sore Healing Stages
Knowing what to expect helps you gauge whether your sore is healing normally. In the first several hours to one day, you’ll feel tingling or burning with no visible sore yet. This is the prodrome stage and your best window for treatment. Within a day or two, fluid-filled blisters form. After about 48 hours, those blisters break open, ooze, and then crust over into a scab. The scab gradually shrinks and falls off as new skin forms underneath. The entire cycle runs 5 to 15 days from start to finish.
How to Treat a Canker Sore
Canker sores heal on their own, usually within one to two weeks. Your main goal is managing pain while they run their course. Topical numbing gels with benzocaine applied directly to the sore provide temporary relief. Rinsing with warm salt water (about half a teaspoon of salt in a cup of water) several times a day can also soothe the area and keep it clean.
Avoid acidic, spicy, or rough-textured foods that irritate the sore. Switching to a soft-bristled toothbrush and using a toothpaste free of sodium lauryl sulfate (a foaming agent that can aggravate canker sores in some people) may help prevent further irritation. If you get canker sores frequently, consider whether you might be low in iron, folic acid, or vitamin B12, since deficiencies in these nutrients are known triggers.
How to Treat Angular Cheilitis
Angular cheilitis won’t respond to cold sore treatments because it’s not caused by a virus. The cracked corners of your mouth are typically a fungal or bacterial infection, and the approach depends on which one you’re dealing with.
For mild cases, improving hydration and frequently applying a thick emollient ointment or lip balm to the corners of your mouth is often enough on its own. This creates a moisture barrier that protects the cracked skin from saliva, which makes the problem worse. Petroleum jelly works well for this. If the cracks persist beyond a week or two, you likely need a topical antifungal cream (available over the counter) or, in cases involving bacteria, a prescription antibiotic ointment. When the skin is significantly inflamed, a short course of a mild steroid ointment may be needed alongside the antifungal or antibiotic.
Stop licking your lips. Saliva pooling at the corners of your mouth is one of the most common reasons angular cheilitis develops and the main reason it keeps coming back.
Preventing Lip Sores From Coming Back
For cold sores, sun protection matters. Two randomized controlled trials found that sunscreen applied to the lips reduced UV-triggered cold sore outbreaks dramatically. Using an SPF lip balm daily, especially before prolonged sun exposure, is one of the simplest preventive steps you can take. Managing stress, getting adequate sleep, and avoiding known personal triggers (illness, fatigue, hormonal changes) also reduce outbreak frequency.
For canker sores, prevention centers on addressing the underlying triggers. Keep your mouth free of sharp irritants (rough dental work, aggressive brushing), manage stress levels, and make sure your diet includes enough iron, B12, and folate. If you notice canker sores appearing after eating certain foods, an allergic reaction could be playing a role.
For angular cheilitis, keep the corners of your mouth dry and protected with an emollient barrier. If you wear dentures, make sure they fit properly, since poorly fitting dentures change the way your mouth closes and create the skin folds where moisture collects and infection takes hold.