Cheilitis is inflammation of the lips. It can show up as dryness, cracking, redness, swelling, or peeling on the lip surface, at the corners of the mouth, or along the border where lip skin meets facial skin. The term covers several distinct conditions with different causes, ranging from a simple reaction to a lip product to chronic sun damage that carries cancer risk. What cheilitis looks like and how it’s treated depends entirely on which type you’re dealing with.
The Main Types of Cheilitis
Cheilitis isn’t one disease. It’s an umbrella term for lip inflammation, and each type has its own triggers, appearance, and level of concern. The most common forms are angular cheilitis (cracking at the corners of the mouth), contact cheilitis (a reaction to something touching the lips), actinic cheilitis (sun damage), exfoliative cheilitis (chronic peeling), and granulomatous cheilitis (persistent swelling). Some resolve on their own, others need treatment, and one type requires monitoring for cancer.
Angular Cheilitis: Cracking at the Corners
Angular cheilitis is the type most people recognize. It causes redness, cracking, and sometimes crusting at one or both corners of the mouth. It can be painful enough to make eating and talking uncomfortable. The most common cause in adults is a fungal infection, specifically Candida (the same organism behind oral thrush and yeast infections). Less often, a bacterial infection is responsible.
Moisture is the usual culprit behind the infection. Saliva pools at the corners of the mouth and softens the skin, creating an environment where fungi and bacteria thrive. This is why angular cheilitis is especially common in people who wear ill-fitting dentures, have missing teeth, or habitually lick their lips. Anything that changes the shape of the mouth or keeps the corners wet raises the risk.
Up to 25% of angular cheilitis cases are tied to nutritional deficiencies, particularly iron, zinc, and several B vitamins. Vitamin B2 deficiency is a classic cause, but low levels of B3, B5, B6, B12, and folate can all contribute. Iron deficiency is another well-established trigger. If your angular cheilitis keeps coming back despite treatment, a nutritional gap may be part of the picture.
Underlying Health Conditions
Angular cheilitis can also signal something deeper going on. It’s the most common oral finding in Sjögren syndrome, an autoimmune condition that causes dry mouth and dry eyes, with prevalence estimates ranging from 20% to 40% in that population. About 8% of people with Crohn’s disease and 5% of those with ulcerative colitis develop it at some point, likely because these conditions impair nutrient absorption and wound healing. Chronic use of inhaled steroids (common in asthma treatment) and any condition that suppresses the immune system also raise the risk.
Contact Cheilitis: A Reaction to Products
Contact cheilitis is essentially an allergic or irritant reaction on the lips. It’s sometimes called “lipstick cheilitis” because lip cosmetics are the most common trigger. The flavoring agents and preservatives in lipsticks cause more reactions than the dyes do. Common allergens identified through patch testing include fragrances, nickel, and a resin called Myroxylon pereirae (found in many cosmetic formulas). Other ingredients that can trigger reactions include castor oil, shellac, sesame oil, and various preservatives.
Lipstick isn’t the only source. Toothpastes, mouthwashes, and even certain foods can cause the same reaction. The lips become red, swollen, and dry, sometimes with small blisters or a burning sensation. If you notice your lips flare up consistently after using a specific product, that product is the first thing to eliminate. Switching to a toothpaste without sodium lauryl sulfate, a common irritant, can help in cases where toothpaste is the trigger.
Actinic Cheilitis: Sun Damage With Cancer Risk
Actinic cheilitis is caused by years of cumulative sun exposure. It develops when UV radiation damages the cells of the lip surface, causing them to multiply abnormally. The lower lip is almost always the site affected because it faces upward, catching direct sunlight, and has fewer pigment-producing cells to provide natural protection.
Early on, actinic cheilitis may look like persistent dryness or subtle roughness. As it progresses, the lower lip can develop white or reddish patches, a blurred border between lip and skin, and a distinctive sandpaper-like texture you can feel when you run a finger across it. More advanced cases may show thickened plaques, cracking, or ulcers that don’t heal.
This type matters because it’s precancerous. A retrospective study tracking patients over a median of 10 years found that about 12% of actinic cheilitis cases progressed to squamous cell carcinoma, a form of skin cancer. Transformations occurred anywhere from 2 months to 20 years after the initial finding. Fair-skinned individuals and people who work outdoors are at highest risk, particularly from middle age onward. Any non-healing sore, persistent rough patch, or changing texture on the lower lip warrants evaluation, and a biopsy is often needed to rule out early cancer.
Exfoliative and Granulomatous Cheilitis
Exfoliative cheilitis causes continuous peeling and flaking of the lip surface. The lips cycle through building up thick, dry layers of skin that then peel off, often painfully. It’s one of the more frustrating forms because it tends to be chronic and resistant to treatment. Habitual lip licking and lip biting are major contributing factors. In some cases, the behavior becomes compulsive, and addressing the underlying anxiety or habit through therapy is part of the treatment plan.
Granulomatous cheilitis is rarer and looks different from the others. It causes firm, persistent swelling of one or both lips, sometimes dramatically so. The swelling may come and go at first but can eventually become permanent. It’s associated with Crohn’s disease in some cases and with a broader neurological condition called Melkersson-Rosenthal syndrome when it occurs alongside facial nerve paralysis and a fissured tongue.
How Cheilitis Is Diagnosed
Diagnosis usually starts with a visual exam and a detailed history of your symptoms, habits, and product use. For suspected allergic contact cheilitis, patch testing can identify the specific allergen causing the reaction. Small amounts of common allergens are applied to the skin under adhesive patches, and the skin is checked for reactions after 48 to 96 hours.
For actinic cheilitis, a biopsy is often necessary. A small tissue sample is examined under a microscope to check for abnormal cell changes and rule out squamous cell carcinoma. This is important because actinic cheilitis and early lip cancer can look identical on the surface. Angular cheilitis that doesn’t respond to initial treatment may prompt blood work to check for iron, zinc, and B vitamin levels, or to screen for conditions like diabetes or immune deficiency.
Treatment by Type
Angular cheilitis caused by a fungal infection is treated with topical antifungal creams applied to the corners of the mouth. If bacteria are involved, a topical antibiotic may be used instead, or a combination of both. Keeping the area dry is just as important as medication. If nutritional deficiency is identified, correcting it with supplements typically resolves the problem.
Contact cheilitis improves once you identify and avoid the triggering allergen or irritant. A short course of a mild topical steroid can calm the inflammation while the lips heal. For exfoliative cheilitis, treatment combines lip moisturizers containing ingredients like panthenol and glycerin with topical anti-inflammatory creams. Lip products with SPF 30 are often recommended between treatments. Patients are advised to stop lip licking, and when the habit is compulsive, referral for behavioral therapy or psychiatric support may be part of the plan.
Actinic cheilitis requires closer attention. Mild cases may be monitored and managed with strict sun protection. More advanced cases are treated with procedures that remove or destroy the damaged cells on the lip surface to prevent progression to cancer. Ongoing sun protection with SPF lip balm is essential regardless of the treatment approach.
Cheilitis vs. Cold Sores
It’s easy to confuse cheilitis with a cold sore, especially when the cracking or redness appears at the corner of the mouth. Cold sores (caused by herpes simplex virus) typically start with a tingling or burning sensation, then form small fluid-filled blisters that cluster together, crust over, and heal within 7 to 10 days. They tend to appear on or near the lip border rather than at the corners.
Angular cheilitis, by contrast, doesn’t produce blisters. It causes cracking, redness, and sometimes oozing at the corners specifically, and it won’t heal on its own if the underlying cause (moisture, infection, nutritional deficiency) isn’t addressed. One key distinction: cold sores are usually one-sided, while angular cheilitis more often affects both corners. If you’re unsure, the presence or absence of blisters is the most reliable clue.
Preventing Recurrence
The single most effective prevention strategy depends on the type. For angular cheilitis, keeping the corners of your mouth dry and addressing any dental issues that change your bite or allow saliva to pool is key. For contact cheilitis, identifying your trigger through patch testing and reading ingredient labels prevents flare-ups. For actinic cheilitis, daily use of a lip balm with SPF 30 or higher, wearing a wide-brimmed hat, and avoiding peak sun hours protect the lower lip from further UV damage.
Across all types, a few habits help. Avoid licking your lips, as saliva evaporates quickly and leaves lips drier than before while also introducing digestive enzymes that irritate the skin. Use a plain, fragrance-free lip moisturizer as a barrier. If you wear dentures, ensure they fit properly. And if your cheilitis keeps returning despite doing everything right, it’s worth investigating whether a nutritional deficiency or underlying condition is driving the cycle.