Which type of ulcer in the mouth typically heals with a scar?

Major aphthous ulcers are larger and deeper than their minor counterparts and have a longer healing time. These ulcers penetrate more deeply into the tissue, affecting not just the mucosal layer but also the underlying connective tissue. As a result, the healing process of major aphthous ulcers typically involves the formation of granulation tissue and subsequent scarring.

In contrast, minor aphthous ulcers are usually smaller, heal more quickly, and do not typically leave a scar. Median rhomboid glossitis presents as an area of smooth, red, and sometimes painful patches on the tongue but does not form ulcers that would scar. Primary herpetic stomatitis involves a viral infection that causes multiple small vesicular lesions rather than distinct ulcers, and although lesions can cause discomfort, they generally do not result in scarring in the same way as major aphthous ulcers do.

Thus, major aphthous ulcers are specifically known for their propensity to heal with a scar due to their depth and severity.