Angular cheilitis — those red, cracked, sometimes crusty sores at the corners of your mouth — affects people of all ages and can range from mildly annoying to genuinely painful. Understanding what triggers this condition is the first step toward finding relief and preventing flare-ups. Here are ten of the most common causes worth knowing about.
1. Candida Fungal Infection
One of the leading culprits behind angular cheilitis is an overgrowth of Candida albicans, a type of yeast that naturally lives on your skin. When moisture collects in the corners of the mouth, it creates a warm, damp environment where this fungus thrives. Research from a prospective clinical study found Candida albicans to be a significant pathogenic factor in patients with angular cheilitis. If your doctor suspects a fungal cause, they may recommend a topical antifungal cream to help clear the infection and restore healthy skin at the lip corners.
2. Bacterial Infection
Bacteria, particularly Staphylococcus aureus, can also play a major role. Sometimes bacteria act alone, and sometimes they team up with fungal organisms to worsen the condition. The same clinical study that identified Candida also highlighted Staphylococcus aureus as a frequent co-pathogen in angular cheilitis cases. When bacteria are involved, a healthcare provider may prescribe a topical antibiotic ointment. Keeping the area clean and dry between applications can support the healing process.
3. Excessive Saliva and Lip Licking
Frequent lip licking might feel soothing in the moment, but it often makes things worse. Saliva pools in the corners of the mouth, breaks down the skin’s protective barrier, and invites infection. People who drool during sleep or habitually lick their lips are especially prone. Breaking the licking habit is easier said than done, but applying a protective lip balm or barrier ointment can help shield the skin while you work on it.
4. Iron Deficiency
Low iron levels can weaken the skin and mucous membranes, making the corners of your mouth more vulnerable to cracking and infection. Iron deficiency is one of the most common nutritional shortfalls worldwide. According to a comprehensive NCBI overview, nutritional deficiencies are recognized contributors to angular cheilitis. If you suspect low iron, a simple blood test can confirm it. Dietary changes or supplementation under medical guidance may help resolve recurring episodes.
5. B Vitamin Deficiencies
Deficiencies in B vitamins — especially riboflavin (B2), folate (B9), and cobalamin (B12) — have been linked to angular cheilitis in clinical literature. These vitamins play essential roles in maintaining healthy skin and supporting tissue repair. Without adequate levels, the delicate skin at the lip corners becomes fragile and slow to heal. Eating a balanced diet rich in leafy greens, eggs, lean meats, and fortified cereals can help maintain healthy B vitamin levels throughout the year.
6. Ill-Fitting Dentures
Dentures that don’t fit properly can change the way your mouth closes, creating deep folds at the corners where moisture accumulates. This is particularly common in older adults who have experienced bone loss in the jaw over time. A clinical examination of local etiological factors categorized ill-fitting dentures as a notable irritant cause of angular cheilitis. Regular dental checkups and denture adjustments can significantly reduce your risk of developing this uncomfortable condition.
7. Weakened Immune System
A compromised immune system makes it harder for your body to keep naturally occurring microorganisms in check. Conditions like HIV, diabetes, and certain autoimmune disorders can increase susceptibility to angular cheilitis. Medications that suppress the immune system, such as corticosteroids or chemotherapy drugs, can have the same effect. Working closely with your healthcare team to manage underlying conditions is one of the best strategies for preventing recurrent flare-ups at the lip corners.
8. Allergic Contact Dermatitis
Sometimes the cause is an allergic reaction to something touching your lips. Common offenders include certain toothpastes, lip cosmetics, dental materials, and even some foods. The reaction causes inflammation, redness, and cracking that mimics infectious angular cheilitis. If you notice symptoms appearing after using a new product, try eliminating it for a few weeks. A dermatologist can perform patch testing to identify the specific allergen responsible.
9. Dry or Cold Weather Conditions
Harsh winter air and low humidity can strip moisture from exposed skin, including the delicate corners of the mouth. When the skin becomes dry and cracked, it opens the door for secondary infections that prolong the problem. People living in cold climates often experience seasonal flare-ups of angular cheilitis. Applying a thick emollient or petroleum-based barrier ointment before heading outdoors can provide a protective layer against environmental damage during the colder months.
10. Oral Antibiotic Use
Broad-spectrum antibiotics can disrupt the natural balance of microorganisms in and around your mouth. When beneficial bacteria are wiped out, opportunistic fungi like Candida can flourish unchecked. A narrative review of therapeutic options notes that understanding the microbial balance is key to both treating and preventing angular cheilitis. If you need antibiotics, talk to your doctor about probiotic support or preventive antifungal measures to help keep the corners of your mouth healthy.
Angular cheilitis can stem from infections, nutritional gaps, environmental factors, or a combination of several triggers at once. Identifying the specific cause behind your symptoms is essential, so consider scheduling an appointment with your doctor or dentist — especially if the sores keep coming back or refuse to heal on their own.
Medical Disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making health decisions.
