Hello
welcome to health care magic
Ulcers in the mouth has many causes most commonly because of
stress,,or because of self bite..
but the ulcers caused by these are not cancerous and they will heal in due time..
Some times ulcers also come because of beetle nut /pan chewing in the mouth or by placing in the innerside of jaw...
these ulcers in due course of time may become cancerous..
If your mother had not habits like this,,then don't worry about the ulcer..
Take multivitamins as prescribed by your doctor.
If the ulcer is growing,then you need to take a
biopsy..
hope you understand my suggestion
Thank you