Hello dear dentists, I had root canal treatment in 2016. In 2022, it was decided to renew my root canal treatment because there was a lesion on my tooth root. I had swelling in my gums. 2 years have passed, but the swelling has reoccurred. There is a small hole in my gum with a structure similar to a pimple tip. When I press the swelling, odorless liquid flows out. It doesn't hurt, and frankly it doesn't cause any discomfort. What is the cause of this swelling? I received orthodontic treatment and had 2 teeth extracted in my upper jaw.