Patient: Five years ago the onset of recurrent episodes of taking western medicine thalidomide fast effect but also a sharp decline in vision also used Chinese medicine vitamins effect is not obvious want a thorough examination and treatment blood and laboratory tests oral bacteria are fine Oral Hospital Mucosa Periodontal: From your description, the possibility of suffering from recurrent oral ulcers. However, the frequency and severity of the onset are not clear, so it is difficult to give a treatment plan. It is recommended that you go to the mucous membrane specialist of a professional dental hospital for examination, and the doctor will give a systematic plan.