Major Ulcers: Larger, deeper, and more painful sores that take longer to heal and may scar. - Herpetiform Ulcers: Tiny, pinpoint ulcers that often occur in clusters.

RAU is classified as minor, major, and herpetiform on the basis of ulcer size and number. The cause of RAU is idiopathic in most patients. The most likely precipitating factors are local trauma ...

It presents as three types: minor (most prevalent), major and herpetiform ... in the treatment of the most prevalent form of aphthous ulcers.