Oral lesions are changes in the soft tissues of the mouth—including the lips, cheeks, tongue, gums, and palate that appear as sores, patches, bumps or ulcers. While many are harmless and resolve on their own, some may signal infection, trauma or more serious health conditions that require expert evaluation. Common Types of Oral Lesions • Canker sores (aphthous ulcers): Small, painful ulcers inside the mouth • Cold sores (herpes simplex virus): Fluid-filled blisters, often around the lips • Leukoplakia: White patches from chronic irritation, such as tobacco use. These lesions can be