Recurrent oral aphthae

Recurrent oral aphthae, commonly known as canker sores, are small painful ulcers that appear inside the mouth, typically on the inner cheeks, lips, or tongue. These round or oval white or yellow sores with red borders tend to recur periodically and can be triggered by stress, certain foods, nutritional deficiencies, or minor injuries. Most heal on their own within 1-2 weeks without scarring.