Canker sores, also called aphthous ulcers, are small, shallow lesions that develop in the soft tissues of the mouth or at the base of the gums. Unlike cold sores, canker sores don't appear on the surface of the lips and aren't contagious. However, they can be painful and can make it difficult to eat and talk. A mouth ulcer is a sore that develops in the soft tissue that covers the gums, tongue, the inside of the cheeks, lips, or palate.
They are usually yellow or red in color and can be very painful. Mouth sores may also be referred to as aphthous ulcers or canker sores. Mouth sores are painful, usually small lesions that develop in the mouth or at the base of the gums. They can make eating, drinking and talking uncomfortable.
Ulcers are painful sores that appear inside the mouth. They are usually red or yellow in color. They are different from cold sores, which appear on the outside of the lips and are caused by a virus. Mouth sores are painful areas in the mouth and gums.
They are also known as canker sores. Canker sores (also known as aphthous ulcers) only appear inside the mouth. You can place them on or under the tongue and on the inside of the cheeks and lips, in the parts of the mouth that can be moved. They usually appear alone, but sometimes appear in small groups.
If your healthcare provider determines that mouth sores are related to an underlying health problem, managing your condition may reduce the risk of ulcers returning. Usually red or yellow in color, mouth sores are painful sores that can appear inside the mouth and also on the outside of the lips. Your dental team may examine your mouth to make sure that the problem is an ulcer and not something more serious, such as oral cancer. Mouth sores vary in size, and the exact symptoms of a mouth ulcer will depend on the type of ulcer the person has.