What is the reason for often growing oral ulcers?

The patient always shows oral ulcer, it has many reasons, specific may be the following reasons. First of all, immunological abnormalities, there may be abnormal cellular immunity of the patient, there may be abnormal humoral immunity of the patient. Of course, there may also be infectious factors, resulting in repeated oral ulcer, such as chickenpox, herpes zoster virus, such as cytomegalovirus, may be related to repeated attacks of oral ulcer. Of course, it may also be caused by genetics, repeated oral ulcers, or it may be due to a lack of vitamins or folic acid. The above plan is for reference only, and the specific drug use should be combined with your own situation under the guidance of professional doctors.