Gum swollen. The swelling gum tissue.

Maybe due to cheek biting Go for opg xray to determine the position of wisdom tooth.

Your cheeks are swollen due to cheek bite issue. Types of cheek biting There are five primary types of cheek biting: Periodic accidental cheek biting. the occasional, accidental cheek bite is not a cause for concern. Regular accidental cheek biting. If you accidentally bite down on your cheeks regularly — and more often than you would like — your teeth may not be in proper alignment or there may be something wrong with your jaw. In this case i suggest you go for a braces. Cheek biting while asleep. This unintentional behavior can be addressed with a dentist-provided soft guard that prevents direct contact of your teeth with your cheek. Habitual cheek biting. As a habit, this semiconscious activity can be replaced by another, less damaging behavior. BFRD. This is obsessive cheek biting that continues despite attempts to stop.

Identify which type of cheek bite you have and go for the above treatment.

most of the patients either have Regular accidental cheek bite or cheek biting while sleeping . if it's regular accidental biting go for braces else use soft guard . Hope my answer is helpful to you.