Hi. Is that a swelling? It is not that clear from the image. If that is something new that has been developed recently with your knowledge then it's advisable to visit a dentist and get and opinion
Next Steps
Visit a dentist at the earliest. Better to visit when you don't have any pain ( less discomfort to you too)
Health Tips
Any abnormal observation should be clarified the moment it is noticed as a precautionary measure. Take care