Hi sir .. Your inical picture seems to be apthous ulcer   Ulcer is break in the continuity of oral epithelium.. There are so many reason fr oral ulcer... **Stress and anxiety **Vit B12 deficiency **Iron deficiency anemia **Gastric disturbance(GEDR, gastric ulcer) **viral infections **Irritation from sharp objects **Genetic factors Apply Dologel for pain relief... If ulcer is due to vitamin deficiency then multi vitamin tablets supplement should be given

Apply hexigel or dologel on the affected area 5-6 times a day. Avoid hot and spicy food. Have lots of curd and other cooling food. Add a bcomplex tablet like supradyn once daily for a few weeks

Mouth ulcers have various reasons. Most common cause is stress. Usually it gets relieved in a week. If it's hurting too much can go in for a short dose of oral steroid. If not mostly it's self limiting. If it doesn't heal by itself, visit a dentist.