### What is Angular Cheilitis? Angular cheilitis is a condition that causes red, swollen patches in the corners of your mouth where your lips meet and make an angle. It can affect one or both sides of your mouth simultaneously. ### Symptoms The main symptoms include irritation and soreness in the corners of your mouth. You may notice: - Redness - Swelling - Cracks - Blisters ### Causes The most common cause is a fungal infection, usually by a type of yeast called Candida. Bacterial infections and vitamin B2 (riboflavin) deficiency can also lead to angular cheilitis. If the cause is unknown, it is termed idiopathic angular cheilitis. ### Risk Factors You are more likely to develop angular cheilitis if the corners of your mouth are frequently moist. Conditions like diabetes can increase your risk because high blood sugar levels create a favorable environment for fungal growth. ### Diagnosis Your doctor will examine your mouth for cracks, redness, swelling, or blisters. They may also take a swab from the affected area to identify the type of bacteria or fungi present. ### Treatment - **Fungal Infection:** Antifungal creams - **Bacterial Infection:** Antibacterial medications - **Unknown Cause:** Petroleum jelly to protect the area ### Prevention - Keep blood glucose levels in check - Eat well and exercise - Avoid smoking