Ulcers are caused because of either trauma, stress, improper diet and lifestyle as well as other reasons. So visit a doctor if it's a ulcer of less than 15 days apply a lignocaine gel it will diminish or else a proper examination needs to be done
If the ulcers are small , less than half a centimeter in size, and go away after 7 days. Then it is most likely aphtous ulcers, there is nothing to worry about. Such ulcers maybe related to stress.
That said, it will be good to visit a dentist and get it checked.
I have mouth ulcer on inside upper lip. I am attaching two photos of day 8 and day 15. On day 15 it seeme
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