About gastroenterologist.. very difficult case to diagnos

A female age 30 years suffering with SLE is having this type lesions in the mouth. What can be the reason and treatment for this.

13 year old boy recurrent lesions as above in the mouth after giving medicine for fever .Similar lesions present in Glans pens and conjuctivitis @Dr. Mohan Krishna Reddy present for last 5 yeras.Treated at various hospitals as BECHETS DISEASE.Biposy done normal.Pl give ur valuable DDS.abd investigation and management .

c/o lesion in angle of mouth since 3days..pain during opening of mouth..diagnosis and treatment?

26 year old male with no known co-morbidites presents with oral ulcers of 8 days duration.no history of trauma,no history of fever no h/o ulcers anywhere else in body foriegn body h/o spicy foods (+) gives past history of mouth ulcers 3 months back. took candid cream and dolo gel for L/A O/E reddish ulcers on palate does nt bleed on touch please help with the diagnosis is it simple aphthous ulcer and what is the reason for the recurrence

23 female with no comorbidities with recurrent ? aphthous ulcers All treatments tried.. Still recurring.. Management???