hello and welcome to HCM forum,
i would be glad to answer your query, first of all i would like to inform you that an
oral ulcer can develop due to any of the following causes,
vitamin deficiency, medical condition, poor
oral hygiene,
smoking, spicy food or even due to constant irritation from a sharp tooth margin or a filling.
i cannot rule out the cause for you until your oral cavity is checked clinically.
therefore, it would be best see a
dentist, he /she will rule out the cause and plan a treatment accordingly.
In cases with recurrent oral ulcers it is very important to remove the cause permanently.
i would recommend a few instructions for you to follow;
1. use an antibacterial mouth wash(twice/day) for 1 week,
2. healthy diet,
3. avoid spicy food for a few days,
4. visit your dentist soon.
i hope i answered your query,
i wish you good health,
take care.