Hi, a mouth ulcer
is a painful sore inside the mouth, on the tongue, soft palate (the back portion of the roof of your mouth), or inside the cheeks.
Sores in your mouth are round, white, or grey in color, with a red edge or border. The condition is usually becomes okay within 7 days. But if it persists beyond that, or if multiple ulcers keep re-appearing, medical advice must be taken.
In severe mouth ulcer attacks, you may also experience fever
and physical sluggishness.
Taking Vitamin B12 supplements along with a suitable gel for pain
is the best remedy.
I suggest that you consult me privately on Lybrate so that I can send you the appropriate prescription.