An oral lesion refers to any abnormal change in the tissue of the mouth, which can include sores, bumps, or discolorations. These lesions can occur on the gums, tongue, lips, or inside the cheeks and may be caused by various factors such as infections, injuries, or underlying health conditions. Common types of oral lesions include canker sores, cold sores, and oral thrush. While many lesions are harmless and may heal on their own, some can indicate more serious health issues. It is important to consult a healthcare professional if an oral lesion persists or is accompanied by other symptoms.