Mouth Ulcer

Mouth Ulcer


Mouth ulcers are painful, clearly defined, round or oval sores that form in the mouth.

There are three main types of mouth ulcer, which are outlined below:

Minor ulcers are the most common type of ulcer. They are small (2-8mm in diameter) and usually heal naturally within 10-14 days.

Major ulcers are larger and deeper than minor ulcers, and usually have a raised or irregular border. A major ulcer is usually 1cm or more in diameter. This type of ulcer will heal more slowly, over a period of several weeks.

Herpetiform ulcers form as multiple, pinhead-sized sores. The number of ulcers can range from 5 to 100. These tiny ulcers often fuse together to form larger, irregular shaped sores, which are extremely painful.

A mouth ulcer is a very common condition, and most people will have at least one in their lifetime.