There are three types of oral ulcer

Repeatedly oral ulcer attack, Medically called "recurrent oral ulcers." Its recurrent oral ulcers and the duration of the length of history closely related to short-term history, the incidence can be a few months or a year; long history, the incidence can be a month or oral ulcer turn the old and new lesions appeared. Under normal circumstances ten days or so could be self-healing and not leave scars.
　　 Recurrent oral ulcers, oral mucosal disease is the most common disease, but repeated attacks have self-limited, partial performance for the isolated, circular or oval-shaped ulcers.
　　 Clinical divided into three types: light recurrent oral ulcers, recurrent mouth inflammatory oral ulcers, recurrent necrotizing inflammation around the glandular mucosa.