By looking at attached picture it seems like a cheek bite. But it could be due to other reason also like any sharp tooth edge.
Wait for a week, rinse with warm saline water two to three times a day, if it heals then nothing to worried about it. If it reoccur then consult with doctor online or offline for better guidance and treatment options.
Answered2022-02-02 07:18:39
Let others know if this answer was helpful