From the history, we could think are you having mouth ulcers or sores. There was stress
) that caused the ulcers (canker
sores) when it actually started. Most of the times it is the stress that reduces the immunity in the person and cause the ulcers. These ulcers or sores in the lining of the mouth which are present on the on the inside of lips, inside of cheeks, and gums are caused by many disorders. It could be Aphthous ulcer as it is most common in young adults. The diagnoses of the type of mouth ulcer is based on the appearance and location of the lesion. The stress factors that precipitate the sores subside but the canker sores remain for few more days to weeks and later subside. As it is continue with the flossing every time after food.
Healthy diet with vitamins and minerals
plus good oral hygiene
may help in the prevention of more mouth ulcers or complications from mouth ulcers. This includes brushing the teeth at least twice a day, flossing at least daily, and regular professional dental cleaning and examination. You can try various home remedies
for pain relief like gargling with warm salt water, applying baking soda paste to those areas. We would suggest you to consult a physician for the further evaluation and management.